All the items that are both looked for and being sold are lvl 61.
So, without further ramblings:
Purple Wired Zapper-Class mod for Mechromancer
Lots of E-Tech weaponry
Pistols: Thunderball Fists, Dubble Gub, Twin Hornet
Assault Rifles: Slag Madhous!
Shotguns: Sledge's Shotgun x2 (one with blade, both unelemental), Flakker
Snipers: Tumtum Skullsmasher
Submachineguns: Hellfire, Slagga, Bladed Emperor
Rocket Launchers: Mongol (Fire)
Grenade mods: Homing Bonus Package, Rolling Thunder
Shields: Black Hole, Bee
Class Mods: Legendary Mechromancer, Legendary Soldier, Legendary Hunter
I'll try to keep updating this list.
Leave your offers and Steam nicks in the comments if you are interested.