I would be cautious of this. Parts may be marked but not meet specification, what we called "floor sweepings" when I was in the trade. Or cheaper look-alike part that has been remarked. The old you get what you pay for etc.
Agreed. I saw the same site. When you read closely, those are USED parts at that cheap rate. (and unless you really need a lot of them, it's not like you can buy one or 2 at that rate)
One of the comments below on that page indicates there were some shorted parts (i.e., defective) in his lot, and that they were replaced. (which is maybe OK, IF you plan on testing all the parts before assuming they work!)
Spending a few bucks for one new part (vs. a few bucks for several used ones of unknown previous life) is worth it in this case, IMO.
-Dave