[Sal Gerace]

Feedback is the most important thing to consider when buying. I always look for feedback that is 98% or better. If a seller has excellant feedback then he does not want to tarnish it. He also has conducted his business properly. eg.returning items not listed accuratley ect.
If the part is supposed to be original NOS (new old stock) make shure it has it's original box or you could be buying a nice reproduction.
I have done over 100 Pay Pal transactions and I feel that they are the best tool on the internet for auction shopping. You can dispute a purchase with them if needed and your items are shipped out right away if you are the buyer.
Check with the three shippers at their websites to calculate shipping. It gives you an idea of what to expect for shipping charges. If the sellers charges seem too high don't be afraid to question him or ask for an alternate shipper.