I would look online at bow shops that have a larger inventory normally, and ask if they were horton dealers bbefore they went under
as if so, many might have parts they would love to get rid of!
a bunch of e mails is teh way to go
can try Lancaster Archery too, pretty sure they were a Horton dealer, and if not they might be able to steer you into the place that might have them
there good guys that work there, or all I ever delt with were!
BUt you can jit your local phone book too and call dealers around you
if no one on E bay has them, that will be your best direction I think!

I have Horton 175 HD, and know a few guys with parts for it LOL
but I don;t use it anymore so?? not an issue for me!
too bad they went under, I thought there reverse limb model was the way to go, so balanced and so much more quiet than a standard X bow?
OH well, once the patent on them expire I expect others will follow maybe!