Today I used Purse.io for the first time in my life. I had some Bitcoins that I wanted to spend on building my next mining rig with GTX 1050 Ti's and a 7th generation i3 processor. Purse has always confused me because I always thought amazon did not allow drop-shipping types of services (i.e., you pay for the product, they ship to someone else), so I was always skeptical of the back-end side of things. Anywho, I decided if I can get a discount on my mining hardware, then, well, it would get better ROI (obviously xD) so I might as well try.
For those that don't know, Purse.io is a website dedicated to fulfilling Amazon orders for Bitcoin, at a discount. How do they offer this discount? Well, it's almost a Bitcoin Exchange, so people will just measure the rate of purchasing whatever you want to order as if it was a premium to get Bitcoin, perhaps for AML/KYC avoidance, perhaps to maintain anonymity, or to get over limits, maybe use a gift card, who knows. What is known is that people are willing to pay a premium for Bitcoin via this website.
When you place your order, you aren't really placing an order, but a wanted offer. It sits in a large pool of other wanted offers until someone believes it to be worth it to do the trade. Eventually, if your rate is attractive and the amount is acceptable to a buyer of Bitcoin, then your order will get accepted. You can see the difference between an order that is waiting and an order that is accepted here:
After an order is accepted, the other user will message you details about the item purchase and shipment as it goes along.