Sounds like a good price? I guess it depends on which parts are missing. I wouldn't touch one at this price point, I've bought Mossberg 500's for sub 200$ prices, that were fully functional.
Aim has some good prices on Leo trade ins.
https://aimsurplus.us4.list-manage.com/track/click?u=980dd9967062dc0c30cc116d0&id=321b7afbbb&e=8e21033d91
https://aimsurplus.com/leo-trade-in-glock-23-gen-3-40s-w-handgun?ref=isp_rel_prd&isp_ref_pos=2
Yeah it's a great price and would make a nice stockings stuffers for Christmas, but with this being said, if I have a quality knife I enjoy using (doesn't have to break the bank) I will make a conscious effort not to lose it, and take better care of. But to each his own. Ymmv.