As some have said, the price of the course depends heavily upon what that price includes. The big issue is how much of the cost of the diving, if any, is included. That can vary dramatically. For us, the nearest place we can teach tech courses in a 6+ hour drive away in New Mexico. Our tech course prices include instructor's costs, including significant travel costs and motel fees. If you are next to lake Tahoe, that kind of overhead for the shop will be much, much less. Some shops will have the student pay a travel fee in addition to the course fee to cover instructor expenses. Some course fees include gas costs; some don't. That can be huge.
The last time I took a tech course myself, the additional fees were more than the cost of the course itself.
---------- Post added January 5th, 2016 at 09:08 AM ----------
I have taught the course both sidemount and backmount. The big difference--and it is huge--is valve shutdown drills. I find it is the hardest part of the course for backmount students, but it is a non-issue for sidemount students.
Whichever course is easiest, though, should not be what you are looking for. You need to be able to do the skills required of you when you do a dive. If you learn the skills in sidemount and then dive backmount, it will not be a good thing if you discover in an emergency that you can't shut down a leaking valve because you avoided learning it on your quest to find the easiest path to certification.