I made a ghetto little incubator out of a cardboard box for my first hatch. It seems to be keeping a steady temp and humidity but i seen a 1602N Hovabator on ebay for $42.99+12.99 s/h, that seems like a good price to me. But is it?
I would try your home made first and see how it hatches. If it does good than I wouldnt get another one. But if it does not do good there will be much better deals than that one. But thats what I would do. Goodluck.
Do you have a feed store or tractor supply near you? If so, I think the prices are pretty similar (at least they are here), but without having to pay the shipping price.