Hmm... here's just my $0.02 worth:
ROTF
Scouts - can be had for as low as $12.88 at retail
Deluxe - can be had for as low as $24.88 at retail
So bear those prices in mind when setting your prices (remember that buyers still have to factor in postage too).
A specific character may not necessarily be available at the above prices, but most stores now price match anyway.
As for the Classics, I think the following are reasonable prices for loose figures:
Classics 1.0 - Up to $15
Classics 2.0 - Up to $20
Alternators & Binaltech, probably $40 to $50 for Alts & $60 for Binaltech.
I don't collect any of the other stuff, so can't help you on those unfortunately.
Good luck with it!