Heck, Irish, the hi-tec's are pretty 'inexpensive' as is. I usually just get them, when I need them, at my LHS. But, I usually use the Airtronics brand servo's.. had great luck with them and they suit my purposes.
Doesn't Horizon Hobby carry the Hitec brand?
Here's one I just found..
http://www.rc-spareparts.com/hitec-u...SD&language=en
Now that I see what you are looking for.. high-torque.. the equal Airtronics is about another $25 or so more than this one.
CGr.