Prices seem to fluctuate pretty regularly for T205s...rarer backs have seen an upward trend a bit and the single prints have remained strong especially in mid-grade. Lower grade has trended down lately but not that far. The reason is that several collections have hit the open market recently (Dan McKee, Love of the Game, and a few others). I think that more being available has caused the t205 market to become somewhat softer. Commons in p-f still average about $11-$14 (up just $1 since 2005-6) and g-vg are about $20-$35 (remained steady since 2008). These of course are raw cards. Data gathered on ebay and other auctions I have personally bid on in the last 10 years. I don't keep super detailed records on prices but just averages and I know what I will pay for certain cards in certain conditions and I am still winning them at these prices.
The rarer cards often tend to move up or down depending on if people see them, eye appeal, and where collectors are in the set or their particular quest. I know of one collector who buys nearly every T205 Wagner and Stahl he can find. Drives the price up on the Stahl a bit but way up on the Wagner (if he see it
)...
Just some observations...Personally, I hope the prices stay nice and low for a long time!
Joshua