Yes, you can fix it on your own. Cost 40-60 and tools.
If you have used a wrench or fix your toilet, you can do it. It's not hard but I have done it twice. The first time was a hassle and the major part is getting the internal door (piece) knob out
look on ebay for WINDOW REGULATOR CAMRY <<YOUR MODEL>>
I bought from this dude and I am completely satisfied.
http://myworld.ebay.com/am-autoparts
I bought from another dude on eBay and the freaking regulator works for 2 weeks and it failed to work. Bought a new one and it works now.
My passanger side broke (toyota original) and I got the part for that dude. It is with my gf at the moment and I will fix it on the weekend.
Another option, junk yard. My yard wanted 100$ for original toyo when i can get it for like 40-60$ off ebay.
Instructions, look up stick or
search for "Regulator"
All the best. PM me if i need help.