If you're looking for a temporary setup, you can always use a rheostat (lamp dimmer) as long as the ambient room temps are stable. I think you can get one at lowes for around 10 bucks.

Another option is the Repti-temp 500R for around 40 bucks. People despise these, but I use a couple all the time for temporary setups and as my primary thermostat in the beginning and had +/- 2 degree swings, which is not bad. You just need to set the probe in the right spot properly.

I now use a Helix proportional thermostat which stays spot on 24/7. You can pick one up for around 140 bucks.

You can look into Ranco or Johnson, which are on/off style, for around 80 bucks. With your low wattage setup, I don't see the need of a thermostat capable of 1500w though.

I think there's another one that I'm forgetting about, but I'm sure someone will chime in with what they use.

There's some ideas for you, run with it and make your decision