Dont need no booth, just keep noisy people shut the fuck up. Grab up a Behringer B1 instead, its only $100. In fact, just buy all BEH shit. Cop a 6 channel mixer for $60, and a pair of Truth monitors for $300.
If you want, i can even give you a website where, if you spend 300 or more, you can break it into 3 monthly payments. $500 or more, you can break it into 5.....