Market price for a Glock 17/19, 18rd magazine?

[DoubleJ]

It's unmarked so I don't know who made it.  Fits Glock 17/19 and holds 18rds.  I want to sell but don't want to gouge the price either.  Any idea what to ask for it in the classifieds?

[Biggerhammer]

Being a "Knock off" and not a factory Glock mag, is going to definitly effect the price. I'm sure you can screw some clown for 40.00 bucks or so.

[DoubleJ]

Hell, I'd keep it for that price.  It works good.  Just never use it.  not worth the extra printing it does under my shirt for 3 more rounds over my 15rd factory mag.