I think the best incubator you can use which is also very cheap, is an old fridge. Spent a little extra on a quality thermostat, they is plenty of room for multiple clutches, very accurate easy to set up, affordable. I have used them for years with great success.
Yep, an old fridge with heat chords or heat mats and a decent thermostat like a pulse proportional habistat, plenty of space in the fridges for multiple clutches.