How much such IG accounts may cost?

I have a lot of IG accounts I am not using anymore, because I quit all that IM sh*t couple months ago. Those accounts are 1-2years+ old, have 1k-10k followers on them (average 1-2k). I used to mass follow people without specific targeting with those accounts.
Didn't want to get rid of accounts at first, but now it's obvious I wouldn't back to this business, so I'm thinking about selling them.
How much do you guys think such accounts may cost?