So on ebay I will only buy from:
crosslake sales - MN brick and mortar store, very good.
trailthis - WI brick and mortar store, also very good...I always check here first. (my personal favorite)

Online I usually go direct to the mfg if I can then search other places for prices. cycling is getting so locked down on price points that sometimes there is no benefit to buy from other places. Google is your friend too.

I won't use amazon, bikewagon, or chainreaction.

I do pretty good with Scheels All Sports too, a chain in the Midwest.