Craigslist advice

[Tmac2200]

So I'm buying from this guy on craigslist and I don't want these sets to get away from me, but I don't know the right price range. He says they are used but mint. They are,

Collection 5 Expansion Set- Warriors & Soulborgs
Collection 6 Expansion Set- Archers & Kyrie
Collection 6 Expansion Set- Shades & Orcs
Collection 6 Expansion Set- Zombie Horde
Collection 4 Expansion Set- Greeks and Vipers
Collection 4 Expansion Set- Heroes of Trollsford
Collection 7 Expansion Set– Spearmen & Riflemen
Collection 7 Expansion Set– Knights Templar

What is a reasonable price range?