If you are mechanically inclined never underestimate how good of an incubator you can build yourself on the cheap...
That or you can modify the cheap foam ones to work better, I did several tweaks to mine and it works much better than when I purchased it... The big issue is the temp circuit on the cheap ones wanders, you have to tweak it almost daily in some cases, mine never wandered drastically but it was still annoying, it certainly wasn't set and ignore... But, that can be remedied if you are inclined...
Until I get done with my big one, my primary incubator is one I made out of an Omaha Steak foam box, I didn't just toss it together, I planned the design but in the end it cost me very little, off the top of my head under $20 to build and some stuff I had laying around... The darn thing doesn't look fancy but it runs rock solid... After the first day of making temp adjustments I ran it the entire season never once tweaking the settings... Brought it out of storage this season and it was running about -1° so I tweaked the temp up a bit and it's been running flawless ever since...
I also built an egg turner for it this season, that again cost under $20 and some stuff I had laying around...
Now, I fully understand that building one isn't for everyone but if you feel you have the skills it might be worth considering...
My new build is based on a large armoire that I picked up on Craigslist for free, I wanted it to look more like furniture and this one just happened to be the perfect size based on my primary design specs... I have most of the components but time has been short to actually assemble it, that and writing all the code and building the electronics to automate it will take some brain time, something the children give me little of... I also plan to document the build so that will slow things down a bit as well, maybe next year...