lol notice the smiley, it's competitive bidding. I'd do it for free even, provided I have the time and the person is polite. Forum Installation - in terms of mod, do you mean moderating the forum - because that's the owners job and its up to them to find someone.
In terms of modding a forum with modifications - I can do that as well, but its generally tedious - and I'd only do it for say $250 points (installation + 1-2 mods).
Note that if a person wants a forum installed, regardless of who they get to do it, they better have the rights to use the software - so IPB 2.3= license , PHBB = public free, VB = license.