Dave,
I don't know what others would consider "fair", but with hardware this old you have to weigh scarcity/demand/reliability all together. I guess its only worth what you can get for it or willing to pay for it! And being a free market person I am, if you can get more, then do so because it is what I would do! To me about $75 + shipping is all I could pay for an A2620/2630 accelerator.
Thanks,
Mike