Okay, so a friend let me borrow the last ones I needed for the achievement, so now I'm going to sell all of mine, except Dustbunny, 'cuz they are adorable!
Magic Rock: 90k SOLD
Gwendolyn: 75k SOLD
Helga: 65k DON'T REMEMBER IF I SOLD HER?!
Yeti: 60k SOLD
Greeterbot: 9k SOLD
Deimaginator, Smuggler,Squid (x2), Bureaucrat: 6k each
Thanks for looking!