On the topic of thermostats, here are some links where you can purchase some! Ideally you'd want to get a proportional thermostat instead of an on/off style one.
Herpstats are top of the line and most recommended. They're more expensive but are well worth it due to their high quality and reliability.
http://www.spyderrobotics.com/index....=index&cPath=1
Vivarium Electronics are also well regarded proportional thermostats.
http://www.reptilebasics.com/thermostats
Jumpstart is a decent and very affordable On/Off thermostat to get started on. However I would treat it more as a placeholder to save up for a higher quality thermostat like a Herpstat, which has a much longer lifespan.
https://www.amazon.com/Hydrofarm-Ger.../dp/B000NZZG3S
Good luck!