We used to have a couple of large dump bins full of used straps, filters, ever ready cases and various other bit's and pieces in the photo stores I managed that the customers used to like to rummage in . it's one of the things that I personally miss in camera shops these days they no longer seem to have them, everything they sell is brand new and there's no chance to find that replacement rubber eye cup for that old camera you have you've been looking for for years etc..