I am sure these days there is more availability - a quick google search for folding craft table brought up this lot. Also people have done some amazing DIY and come up with designs of their own, lots of examples on the rather brilliant Ikea Hackers site here. (I promise I am not on Ikea's payroll!).
My table is quite large, the centre section is 21 x 40 inches and each folding bit is 26 x 40 inches.
The middle section has a slot for cutting mats - mine has mysteriously vanished in the move but it is a really useful place for stashing rolls of tracing paper etc. too. There are also drawers - one side has 5 drawers, and the other has two drawers and a cupboard with a slide out bottom for a machine.
The legs are gate leg style on casters for easy folding and the centre section is also on casters.