Looks like that wood playpen I have is still available and being sold by Happy Henry homes. Except it's double the price I paid! It used to be sold by Zooplus but not any more. It's an excellent playpen though, I've been using it for years.
It looks the same - but there is a slight difference. Mine has door cut outs in the side. They're filled in rather than cut out, but the option is there to pop them out to make a door entrance (which I haven't done, I prefer it solid).
Hamster Run Enclosure - Formaldehyde Free, Non Toxic, Wooden, Slot Together | Happy Henry’s Homes
Playpens
Threaded Mode