I think it depends on where folks live. If you're lucky enough to be near a Bass Pro or
Gander Mtn. or near a Camping World, you can get some pretty interesting stuff for your camping needs.
Up here we can get some stuff at Canadian Tire, or just whatever your local RV place sells,
although they tend to be pricey. Many on here DIY things from some pretty unusual odds and ends.
There's a link to a homemade outside shower in this thread that's pretty ingenious.
Have a look through the "Tweaks, Mods & Projects" section of the forum. People will usually say where
they get their parts and materials from. Might be something in there about tables. Or the keyword search
facility near the top right corner of each page can be handy to find stuff on here too. Just be patient, and
someone will surely know more than me about your question, or suggest something.
Even Walmart has a decent selection of RV or camping things (and furniture?).
They have an external standalone shower room that we looked at,
but thought it'd be a pain to set up and take down.
BTW, where'd you get your Zodi Hut? Price? If you don't mind my asking.