For cheapo but good, try a Rico Graftonite, or even better, Metalite. They work particularly well in baritone sizes. My top tip would be a Metalite M7. "Looks like a hoover attachment" to quote Jules, but plays a storm.
Looking for a bari sax mouthpiece, cheaper the better, more open and larger chamber the better too!
I've got two Pillinger pieces, a Runyon 'Spoiler' and a spare Yamaha stock 5C(I use one of these as my main M/P, very nice and underated) PM me if interested