You could build an incubator. Incubator Warehouse has parts and kits. Below is a link to an all in one thermostat, heater, and fan for $70. All you need do do is build a box for it and maybe find an auto turner.
https://incubatorwarehouse.com/48-watt-incukit-dc.html
Half size auto turner-
https://www.ebay.com/itm/2042179595...U69G9oyoAuFA4BLHnT8iWIvhk=|tkp:Bk9SR7aB4728YQ
https://incubatorwarehouse.com/48-watt-incukit-dc.html
Half size auto turner-
https://www.ebay.com/itm/2042179595...U69G9oyoAuFA4BLHnT8iWIvhk=|tkp:Bk9SR7aB4728YQ