"Flattop" ($0 cost to build)

My #1 cbg with one of my first builds which is actually just the speaker cabinet made from an "Acid" cigar box and some recycled computer sub speakers. I use it primarily with my Pignose "Piggy In A Box" amp pedal. This one gets pretty loud so I save that for when there's a drummer or a loud cajon player. I love easy setups of simple, low volume gear without all the fuss of cables or even power; just grab it a go out on the porch or lawn and and some life to the gathering without needing to get too noisy (or even play very well, fortunately :)