We have the first two albums, and bought the second two, plus a couple of t-shirts. Their stuff is available online too. We also found out that they've been crowdfunding the purchase of new instruments, so this counts toward us supporting crowdfunded projects. \o/ We actually got in line before the concert, but they had to close the line to start the concert. I suggested giving out numbers to those of us who hadn't gotten through -- we'd been standing there for 20 minutes -- which the staff did. If this happens to you occasionally, you can write numbers on scratch paper. More than occasionally, just buy a strip of tickets you can tear off and hand to people, it's faster. So we were able to get our swag quickly after the show. :D
I suggest booking these talented ladies at Worldcon some time. They have played other conventions, they already know a bunch of fan-relevant material, and there is nothing else like them.