Amazon Prime Day has almost ended, and if you've already got everything on your list, there's one thing worth checking before the sale finally draws to a close: the extra perks that come with a Prime membership.In addition to unlocking access to Prime-exclusive deals, Amazon's Prime membership also includes fantastic tie-ins to the annual mega-sale. Those include extended free trials, giveaways, and member-only promotions. After digging through the retailer's latest offers, I've found perks worth roughly $555 in total.Highlights include lengthy free trials for Amazon Music Unlimited, Kindle Unlimited, and Audible, with the latter offering up to 3 audiobooks to keep forever. That's a promotion I always shout about every Prime Day. There are also opportunities to score free groceries, claim a complimentary GrubHub+ membership, and even earn a $200 Amazon gift card when you sign up for an Amazon Visa. There's even a promotion that gets you a $5 pizza at Little Caesars!These offers are reserved for Prime members, but if you haven't signed up yet, you can still access them with Amazon's 30-day free trial. That also unlocks all the Prime-exclusive discounts available throughout this year's Prime Day sale.The best Prime Day perks to claim right nowAmazon Prime: 30-day free trialIf you've never signed up before, you can get a 30-day free trial of Amazon Prime to get access to this year's Prime Day deals. You get the same benefits as paid members, including free delivery, and access to other services such as Prime Video, Prime Music, Prime Gaming and more. You can cancel at any time during the trial to avoid paying the regular fee, which is $14.99 / £8.99 per month.View DealAmazon Music Unlimited: free 4-month trialGet access to high-quality audio streaming and 100 million songs completely free for three months with this limited-time offer. Ad-free streaming, unlimited skips, curated playlists, and Alexa device support make this a great way to get music streaming ahead of Prime Day this year. Note that this promotion is available for new subscribers only.In the UK: free 4-month trial at Amazon UKView DealAudible membership: free for three months at AudibleAudible is Amazon's premier storefront for audiobooks, with a vast library of over 1 million titles. Right now, as part of an early Amazon Prime Day promotion, Prime members can get a full three months of membership on the house! Normally costing $8.99 / £5.99, the standard membership includes unlimited access to the non-Plus library and one free book token per month. In the UK: free for three months at Audible UKView DealAmazon Kindle Unlimited: free for three monthsSave $30 / £24 and get yourself unlimited access to over a million books, magazines, and audiobooks for three months with this exclusive deal for Prime members ahead of Amazon Prime Day. Read and download books onto any Kindle, iOS, Android, PC or Mac and enjoy offline reading anywhere with this rare extended free trial.In the UK: free for three months at Amazon UKView DealAmazon Prime Visa: get a $200 gift card on approvalAmazon's been offering its Prime Visa for a few years now, but the retailer is currently offering a particularly good introductory tie-in deal for Prime Day. Right now, if you're approved, you'll get a very handy $200 gift card to spend over Prime Day (or, on anything at Amazon for that matter). If you tend to order a lot on Amazon, this could be worth picking up regardless since you'll get 5% back on all purchases if you're a Prime member, as well as other excellent additional perks.View DealIf you're a Prime member, you're automatically entitled to a free Grubhub+ membership. That's a saving of $120 per year on memberships, and if Amazon's marketing is to be believed, an average saving of $300 for most people on deliveries and such. Alongside free delivery and access to exclusive promotions, Prime members can also get $5 off their first order with the code FIRSTORDER.View DealFree Groceries for a Year sweepstakes If you spend $15 or more on qualifying online groceries on Amazon, you can win free groceries for a whole year. Winners will be announced weekly leading up to Prime Day, and if you win, you'll be awarded as $10,000 in Amazon.com gift cards.View DealLittle Caesars $5 pizzaWho doesn't love cheap pizza? Between June 15 and 26, Prime members can get a $5 Little Caesars classic large pepperoni or cheese pizza, for savings of up to $30, depending on location. You can order at the Amazon Little Caesars page, and this offer is redeemable up to five times on different daysView DealSpider-Man: Brand New Day early screeningSpider-Man fans will get treated to an early screening of Spider-Man: Brand New Day two days before its release on July 31. Prime members will just need to sign up for the early screening ticket notifications.View DealWin a $1,000 Amazon gift card with Alexa for Shopping Prime members can win a $1,000 Amazon gift card when they set up a deal alert with Alexa. You must set up a deal alert by June 18, and 100 winners will be selected by Prime Day.View DealThe best Amazon Prime Day deals — quick linksAmazon Devices: Fire Sticks & Echo from $18Amazon Haul: viral gadgets, tech & appliances from $1.99Apple: MacBooks, AirPods & AirTags from $29Back-to-school tech: 48% off laptops, headphones & tabletsCheap TVs: Samsung, Sony & LG from $89.99Headphones: 50% off Beats, Bose & SamsungLaptops: Apple, HP & Dell from $199Smartwatches: up to $250 off Garmin & AppleVacuums: Dyson, Shark & Bissell from $34