Prime Day isn't for another week and a half, but Amazon isn't waiting to start the deals. The retailer is currently running several special offers which are only available to Prime subscribers, including one that just started today.
Amazon prime subscribers who buy $20 in Kindle ebooks between now and 14 July will get a $5 credit good for future purchases.
All Kindle ebooks except pre-orders are included in the offer.
All you have to do is click the button on the offers page, and then buy the ebooks. According to the fine print, Amazon will inform you of the credit within 4 days of buying the ebooks.
The $5 credit will be applied to your next Kindle ebook purchase, and if it's not used then it will expire in a month. (Amazon will also send a reminder when the credit is nearing expiration.)
Amazon is running four other promotions for Prime subscribers right now (at least). They can get one year of an Audible subscription for $119.50 (if you are new to Audible), and they can also get three months of Kindle Unlimited for free.
Also, Amazon is giving Prime subscribers two free ebooks from the First Reads program (usually it's just one free ebook). And last but not least, Prime subscribers can also get four months of Amazon Music for only $0.99.