Incubator

I want to buy an incubator. I want an incubator with place for about 3-4 incubation boxes (small-medium boxes).
I checked on eBay for incubator, but there are too many options and I don't know what will be the best. I need a good incubator- but not too expensive.
A friend told me that he brought HOVA-BATOR and it was a good incubator.
Can anyone recommended me about a good incubator?

Thanks,
Nir