Maybe it's time for some laws that require customer-returned goods to be sold as used merchandise unless the merchant waives the right to dispute the 2nd customer's return for full refund.

It's simple: You should never buy anything from Amazon unless the buyer is recognized or trusted. The definition of "recognized or trusted" is up to you, of course, Amazon will not really help mush with this. I try to filter for major brands or brands that I have purchased from in the past. Sold and shipped-by Amazon also applies.

I'm more impressed by the fact that there's still DDR2 going around. I know DDR3 is still alive and well, even manufactured(I myself noticed the appearance of new DDR3 kits, which is weird); but didn't knew DDR2 was still in stock. I'm assuming industrial/embedded applications still use it for obvious reasons, but I have to wonder to what degree DDR2 kits are being produced.