Amazon's Prime Day is here, bringing with it festive cheer and deals galore. Well, one out of two, anyway. The retailing giant is celebrating its 20th birthday with 24 hours of money-saving deals, available exclusively to Prime customers. (Although anyone can sign up to the standard, 30-day Prime trail for free to get in on the lower prices.) The retailer is promising "more deals than Black Friday," with some low prices available for the entire 24 hours, while others will be fleeting "lightning deals" — flagged up temporarily on Amazon's Prime Day landing page.

Before we get into the categories though, it's worth flagging up one of the best deals currently available: $10 free credit with purchase of select Amazon Gift Card multipacks. That's literally buying money for less money! Take advantage of this deal and you're basically a foreign exchange trader! (We should note that it's not clear when the $10 credit is applied to your account. Some customers have reported that the credit isn't made available the moment the gift cards are purchased, suggesting you have to wait till they ship.)

We'll be updating our lists throughout the day, although beware — many deals are only available in limited supply.

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