What's the going rate for slips?

[Lemmy Lugosi]

I have several slipcovers that I'm going to list in the trading section soon.....can anyone tell me, on average, what is the typical price for just the slipcover?

I honestly just want to move them, so the high end of that price range will be unlikely to be hit....except for my Season One of The Walking Dead slipcover, signed by the fellow who portrays "Glenn" (Steven Yeun). That one might be a bit higher priced.