I buy single copies from greysheet.com. Thet're worth the few bucks they cost if you're doing much buying.
RedBook is retail and often on the high side. Greysheet is wholesale so you can add in 10 to 20% or whatever you're willing to pay over "dealer" pricing.
The best and easiest is to go to the PCGS web site and use their price guide. Those are on the high side similar to the Red Book. Just take any price you see there and reduce by about 20% and you have a decent, up to date price listing. their prices are updated constantly unlike most that are done only periodically.
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