I just wondered where you can purchase wireless guitar - amp things like Angus uses

Also how much would it cost for a "decent" one?
Guitar center, lots of websites aswell such as musicians friend. Any website that sells guitar/music equipment will have wireless. You should only really purchase it if you are gigging, its not necessary if u just play in your bedroom and stuff.
any guitar store, or ebay would be good too. i'd say $250 at the least, and the very best rack ones can get up to thousands of dollars
Now officially has too much gear to list

PM me if you want to know about my recording setup
^, and even then if u dont have rly long cables and run like mad around the stage, like Angus. And most ppl agree with Neil Young, who never uses wireless, b/c Transistors (the wireless) ruins sound, and is why we brought back analog tube amps.
And analog>digital.
lamb of god say they use the wirless to get some more distrotion.
ibanez rg 270

spider III 210