bought mine at The Anderson's but I would imagine Lowes, Home Depot, Menards, etc would have them too.
IIRC it was something like this package wise. I tore it open and tossed the box. Has pretty much the same stuff.
I have like 30' of hose for my shop vac and rigged it so that the brush was gorilla taped just in front of the hose and slid them both through the piping.
http://www.bestofasseenontv.com/dryermax/dryermax2.jpg