need a budget one, the cheaper the better really. Are gas ones any good and what's the benefit of them ?

radio shack sells them for like $20
"Music is the only thing that makes sense anymore man, play it loud enough it keeps the demons at bay." - Jojo from ATU
Currently Own:
Ibanez GAX70
Peavey VYPYR 15.
Mitchell Acoustic M0100
Johnson Acoustic JG 100