This is a commercial Buck 188 M9 and prices are hard to guess. If you need the parts you list look on ebay and do a serach for Phrobis. There is a seller on there that has Phrobis parts in the stores area (sells by the name 1soldure2another). I have bought quite a few things from him over the years and he used to be a member and post here. He may only have the pouch or straps from LanCay or Ontario at this time but they will work even if not correct for collector purposes.
Tell him we miss him if he wants to come back!
Pouch is here
Complete LanCay Sheath is here
You can find the belt attachment group sometimes but for the price a complete sheath may be just as cheap.