Cheap ways to keep an enclosure at 65 degrees?

[Serendipital]

So I'm very interested in keeping salamanders/newts, but the temperature is a big barrier for me...I read an article on all the little ways to lower temperature, but as someone whose room is usually 75 or so degrees, I would need to lower it 10 whole degrees...so I was interested in you guys's set ups and how much it costed. I don't think I'd want to spend more than $30-$50 on cooling equipment though, so tell me if this is totally unrealistic. Thank you!

 

[ntny]

you can try keep them in a coleman cooler box or foam box
and put some coleman blue ice blocks.
but you will need to change them everyday to keep cool
its very tedious