Of course there are a lot more weapons out there than I have for sale here. You might've seen something in your pitiful life that I haven't, however unlikely. GM: Basically, you can make up whatever you want within reason. Although guns have strict limitations, get creative with blades, etc. and it's all good.
I tell you though, if the Guardians catch you doin anything... bad, you'll wish you never laid eyes on weaponry.