I shopped long and hard for a replacement, and finally settled on the Rion Prestige 8 x 8 greenhouse as the most bang for the buck.
It came in three big heavy boxes, with several hundred small parts, which seemed to breed within their boxes. Make that several thousand small parts.
Some assembly required. The saleswoman on the phone told me that two people could put it together "on a good Saturday." One, perhaps, that happened to be June 21, the longest day of the year. And one when maybe five other people, each of whom had engineering degrees from MIT and giant toolbelts, stopped by to help and brought two friends to make runs to town for different lag bolts. And when you had floodlights rigged up so you could work past midnight. I'm guessing that was the kind of "good Saturday" she was referring to. Ours was a good Saturday, but it was not that good.