Re: Starters on Ebay
EBay can be a great resource but you have to be careful. Good feedback is a plus but you have to look at the recency of ratings too. I have seen very high volume sellers with high ratings, because the number of negatives is low in relationship to the overall activity, but when you look at recent feedback, there are quite a few bad marks. Often times this happens when the seller's business has grown to a point where he/she is having trouble keeping up with it all. I think these situations are just a matter of getting overwhelmed and sloppy.
If the parts that are being advertized appear to be new or rebuilt, I would do some checking on the business in places other than EBay. For example, a business that is doing a high volume off such items is probably an "inc" or "llc," and as such, should be registered with the Secretary of State in whatever the home state is. It might also be a BBB member. The point I am trying to make, is to check them out to be sure that things like warranties will really be honored.
All of this said, I'm with Benny - I tend to buy new parts from recognised sources, and when I buy used parts, I don't pay much and just assume that having them rebuilt is a possibility. Like Benny, also, I've been very happy with local rebuild shops for things like starters.