If you're up for a little DIY, and have a little time, you could probably build a t-bar/mount setup for $5-10. iirc, I've seen pictures of the CA's setup in 1/2" PVC couplers (45deg), joined with another 1/2" PVC rod. I do the same thing, except with 3/4" pieces and have a nice 90deg NOS mount for a set of omnis.
I don't have a link to pics, but I know I've seen it on here.