Stickley Student desk chair and student chairs

Found some nice wood chairs made by Stickley...I know one of them is in the museum and the others are just regular chairs, I am trying to put a value on the regular chairs. I know the desk chair is worth a few bucks but do the regular chairs with no desk have any value to them? Curious how old they might be as well. Any help is much appreciated. I really just wanted one but I am going to have to buy over 20 of them...Would love an approximate value before I blow too much money on themAttachment 7199Attachment 7200Attachment 7201

Thank you.