As for the cheapest one, Illinois Jacquet seems to consistently sell for $40-50: https://www.discogs.com/release/3220518-Illinois-Jacquet-The-Complete-Illinois-Jacquet-Sessions-1945-50 (image attached).
There is currently a copy for sale for $30: https://www.discogs.com/sell/item/3007939706
Buck Clayton sells for cheap as well: https://www.discogs.com/release/7114702-Buck-Clayton-The-Complete-CBS-Buck-Clayton-Jam-Sessions . Got me a sealed copy for €40 recently, and I can't even say that this was a particularly great deal price-wise (no complaints music-wise).
In general, CD sets - with few exceptions - don't seem to be valued that much.