the fair price is what you are prepared to pay for it
some modules are normally scarce (not just because of the current ongoing global) situation - this is one of them
ie demand outstrips supply and therefore used modules command a premium
if you only want to pay retail find a dealer that will take pre-orders or contact the manufacturer and have patience, lots of patience...
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities