I poked some holes in the lid and set up the CHE on a reptile lamp stand above it. And with a dimmer all the way up (so its on the lowest heat emission), it raises the ambient about 5F.
Lamp stand - $20
CHE bulb - $18
lamp cage + clamp - $16
= approx. $54
And if he had no issues eating at the breeder, it could still be husbandry, the feeder, etc.
Anyway, for your set up, I'd definitely recommend getting some leafy decor like these. It'll make the enclosure feel more enclosed, so he'll feel more hidden and safe. If you have the resources, it wouldn't hurt to get two small hides (the one you haven't isn't bad, but with how small he is, there's likely quite a bit of space left over still). Reptile basics has some very small hides.