If you have any knife you are willing to sell for less than 25 dollars btc, LMk
Most knives, even the cheapest, sell for around 30$ even on OPSKINS and Bitskins. It's difficult to find knives that cheap, especially since you can get better prices unloading elsewhere. Prices for skins are plummeting because of the gambling ban and people cashing out because of that, but I really don't think you're going to find anyone willing to sell anytime soon. Bitskins and OPSKINS do have a few around 27-30$, though, so good luck getting a knife. I would sell if you took higher tier knives, as I have a few Karambit Fades and glock fades I need to unload.