I just paid $2500 for 2- 9x8 overheads with high lift and roof pitch kits. 7 years ago I paid about $2000 for 2-9x8 with high lift. Took me about 4 hours to install all by my lonesome.
Just so you know, there has not been a single confirmed death report in the US from a torsion spring install in at least the last 50 years. No hospital records, no news stories, no police reports, no lawsuits, no obituaries. I'm not saying it's not dangerous, but no one is out there dying from installing a torsion spring. I actually kinda enjoy winding them.