How can i find values?

I'm considering starting to collect PSA graded cards of particular players - how can I find out what the current going rate for a particular card in a particular grade is? I've notice that there is a wide swing of values on BINs on ebay for the same card in the same grade.
Thanks - getting back into the hobby after a 20 year layoff...
Thanks - getting back into the hobby after a 20 year layoff...
"If we are facing in the right direction, all we need to do is keep on walking." - David Brent
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VCP will give you more up to date pricing, but in all honesty pricing is down in this economy so sellers who do not need to make a quick profit are going to sell above VCP and hold their ground.
What I'm looking to do is put together a set of starts / semistars from the 50s and 60s (Roger Maris, Roberto Clemente, etc), one of each of thier cards in PSA 7 or so. Rather not pay to get the priceguide since that will take away from my available capital.
http://www.unisquare.com/store/brick/
Ralph