I think you should get them a bit healthier before you try to sell them for what you picked them up for... a week isn't much in terms of rehab. If someone wanted to invest a lot in to an Ig why wouldn't they just buy a well started baby for $20 like you can find them everywhere and buy all of the right equip from the start.

I do hope you find a home for them...I see this more as you didn't know what you got yourself in to... Honestly it was great that you "rescued" them but I know that the pet store is just going to get more because they think they can sell them regardless of condition.

Good luck re-homing them.

Jason