I think it is about $17. You will need to bring something to take it home in. They have cardboard carriers for sale for an additional $5.
I have no idea to tell you the hard truth but I strongly suggest that you go to this shelter on Tuesday at 8:00 a.m. and ask someone at the front counter or go to their website for more information. Good luck!
Sorry but you will have to call them since I've never adopted a guinea pig.
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