Has anyone used or seen whelping boxes built by Steele City? http://www.cedargoldens.com/Whelping-Boxes.html Might be a comparable alternative to a Jonart.
I have a Jonart, and love it, but the Steele City appears to be comparable, and the price is really good. You have to make the comparisons and then make your decision. But, check Steele City out.