As far as prices, I only looked at a few items and they were the same when you factored in the "handling" charges from their website, no handling prices on ebay, but they did include the handling already on the item.
Like the 30501 exhaust:
Jegs: $189.99 + $12.99 handling = $202.98
Ebay: $202.98 no shipping or additional handling (already factored in) -$50 = $152.98
