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					Originally Posted by Exhibitman  ...When I price cards for sale, I check comps on eBay and I factor in the shipping cost and taxes as a component of sale...
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 I do the same thing, even though I'm usually on the buying side.
I collect mostly T206 and vintage Topps cards.  There are plenty of sales just on eBay for these.  In other words, it's very easy to find "comps" for the stuff I buy at shows.
When creating my "want list" in advance of the show, I use Excel.  I use Terapeak (eBay store tool) and chart the last 10 sales of each item.  There are 3 columns:
- The price a card has sold for
- Shipping
- Sales tax for my state
The total is 
what it would have cost me out-of-pocket to purchase that item.
I'll average the recent sales...and that's my "comp" for the card.