(the info below was sent to “Feif Un”s email address, which he supplied in another thread. it’s being reposted here, just in case it is useful for anyone else.)
I looked up Leiters phone number and called them for the shlock info.
They do sell the accordion-fold style shlock, but it’s no longer made of corrugated white plastic – it’s now made of vinyl.
It is sold by size, and the size is customizable.
The sukkah itself has to be strong enough to support the frame; the person I spoke to said it isn’t suitable for a canvas sukkah. (Personally, I’d probably try to jury-rig something, but that’s what he said.)
He also confirmed that it’s the design I remember, which is based on the patented design of Tzvi Goldman from Lakewood.
Here is their contact info, copied from their website:
SHOWROOM: 1346 – 39th Street
Brooklyn, NY 11218
Phone: 718-436-0303, 718-436-0909