i would reccomend using your petco gift certificate to buy a ZooMed ReptiTemp 500R or something similar if they have it (should be around $30 give or take, not sure about USD) and skip the UTH's from there. You would be able to plug both heating devices into it.

as for heating I would go with some Flexwatt. for 2 tubs it would cost you under $10 as you probably would only need 2 feet of the stuff. I know of a site where you can even order it pre-wired and ready to be hooked up to your stat.

that's just my 2 cents