Well, if all you need is the six transistors, I think you can get them from Bob Roberts for under $5. Then you just need a 1/4" nut driver (to take the deflection board off), and then a screwdriver to remove the six transistors and replace them with new ones. A multimeter is good to have present so you can make sure there is no continuity between them and the frame (make sure you put the insulator back between them and the frame), and maybe a soldering iron if any of the wires to the transistor sockets have broken off.
Now - if the entire chassis needs repair, you can either do it yourself with a rebuild kit (maybe $40) - if you know how to work on monitors and can solder - or pay someone to fix it for you.
Personally, I charge $50 + parts + shipping to fix a 6100. Parts costs depends on how much you want done besides the repair parts and caps. If you want the low-voltage upgrade done, or any of the Deluxe parts upgrading Bob recommends, then obviously that costs more....