PM answered.
I've yet to attend a convention for TBS-- my undergrad years were spent in chapter survival mode, and since no one in my chapter had a car (not really a desired thing in Boston with $300 + per month parking fees), we couldn't do any road-trips.
I'll be going to my first set of them this year-- both our district and precinct conventions are in New England, and I'm being the alumni road-trip chair. I'm planning on dropping a lot of money on the "swag" I never had as an undergrad. *grin*
~ Mel.