Not bad price, Free delivery is showing up without active Prime for me, Great upgrade for a Dell Optiplex.
On that note, I recently got an i5-2500 for $25 delivered from eBay, it was an enormous upgrade over the dual core that was in my Optiplex. There are dirt cheap Dell Optiplex's on eBay, can get one with all the upgrades or do it yourself.
This is listing says SA400 in the title but then refers to the A400, so possibly the same model. I have this one and the Sequential Read is maybe 350MB/s from the day I bought it, not perfect but still good for this price.
Update 3 Sept: Price dropped to $34.
I got one of these a few years back. I was worried about a kingston as a primary drive, but after running non-stop for years, still goes strong.