The best ones would be mini fridges converted into incubators in my opinion however I saw your post about it being a surprise. Hovabator (I think that's how it's spelled) makes one and you could use that along with a thermostat. If you're really strapped on cash and time and I'll probably get some hate for this, there is one you can make out of a styrofoam cooler and a light bulb for about $15-20. Given you have a room that stays the same temperature you could set it up and it should work pretty nice. I'm currently using it on leopard gecko eggs and I'm getting a good 81° with a 15w light bulb.