Ipod to take to summer camp

Please recommend what Ipod/Mp3 player to get my kid to take to 3 week sleep away summer camp. They are not allowed to take phones.

I was looking on Ebay and was confused by the many options.

Thank you.

EDIT: Thanks you to everyone for your help. We purchased a Apple iPod video 5th Generation 30 GB for $30 from ebay.