tubeless virgin here-
just ghetto'd a old pair of Maxxis single ply's, with caffe latex spooge.
front went up first time with a garden sprayer, rear took a bit more effort, - the side wall bubbled for about 30mins before it sealed- but has been fine since!
9.99 for the caffe stuff
5 for two bmx tubes
oh, and weighed all the bits - have saved ~ 250 grams of rotating weight