Department stores, etc.. to buy a boost-controlling device

[mk2vr6]

I want to install a boost controller today and I'm just wondering where I can buy a boost-controlling device at a major store..  Like Canadian Tire or Wal Mart or Home Depot... etc...

Whats a good device to use?  I'm guessing needle valves and the like arent a good idea...?  I've heard of the old check-valve (grainger valve)...  Any other ideas?  Thanks for the help.

[SMOKEYDUB]

anything that will fit the wastegate lines and will bleed some air. I think i got mine at princess auto or home depot i forget...