Hey NoVA--check out some of the incubator designs on this site, and search the threads. Several people have made good homemade bators for under $10. I think one person used a $2 styrofoam cooler from Walmart (I saw some for $1.88 at Tractor Supply not too long ago). They then used a light fixture & bulb they already had, and adjusted ventilation & insulation until the temp was where they wanted it.
Good luck!
Good luck!