Routers are normally between £30-60, and yeah you have to use one, especially if you're making it lidless.whats better at heating a rack, cable or mats? i know cable would probably keep energy costs down due to less plugs. can you get cheaper garden/green house heat cable that works just as good?
do you use your own router aswell?
I think Bothrops (mod on here) used a garden heat cable, and it worked just as well.