4 Tickets to Desert Museum in Tucson

I have 4 free passes to the Desert Museum. I am asking 30 dollars but make me an offer or trade me something. Summer rates are 9.50 per adult and up until June its 13.50 per adult..

http://www.desertmuseum.org/visit/hours.php

Its very fun, especially for visitors and/or kids. I love going there but I have been there a bunch of times and dont really have anyone to go with anymore.

I still have these.. 10 bucks? Im afraid I wont use them by the time they expire in September.