if its temporary, just get a sterlite tub big enough for the little guy, if its a baby all he needs is a 6 qt, they cost a dollar. well your using 2 hides so i guess you might want to go a little bigger, 15 qt or something. my ball pythons are kept in sterlite tubs their whole lives and do great.
and just about any uth will work, flexwatt being the cheapest, just needs to be regulated.