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MarkPresspins.com has lots of info and actual images (year by year...) This company used to go by the name "Recollectics".
They also have retail prices listed, as they sell them on-line and have been doing so for some time. Keep in mind, that these prices are RETAIL, and would typically go about 30% cheaper on Ebay or via other mid-range auctions.
If you are looking to BUY press pins, the group lots offered by auction houses are the way to go. The "price per pin" is almost always less when they are offered in bulk, or in groups. Hope this helps.