Most BBQ tank regulators are fixed pressure regulators. Usually set at 1/4 to 1/3 psi.... And they do NOT come with lefthand thread "B" connector on out put side for connecting to the "twin hose" that is so popular to use with Fuel/Oxygen torches....
This is "typical" only it was assembled from pieces from RV supply store...
Several different types of Propane regulators can be found in following sites....
http://www.tejassmokers.com/gasregulators.htm
http://www.cajunshoppe.com/regulator.htm
http://www.protanksupply.com/regulators.asp
Though you can get "something" at local hardware, home improvement store, I suggest you stay with a quality adjustable regulator for welding applications for a better flow control when used with your torch... You bead is not a hunk of meat or weeds to be burned........
Dale