Wow, $150 is getting up there. I don't know if the local Mathews dealer sells CX or not, I don't think so.
Are they just too new that there aren't any 250 shafts, or will they only be 350's?
I would think they would have to be in both sizes Chrud but I would also guess you're right about the too new to be available especially when my shop had one dozen left and just about sold out. Needless to say I did not buy the last dozen.