I found mine during a council clean-up - no money spent. Sometimes you can scavenge the legs off one table and instal them onto another tabletop too.
There's an IIS project for an inexpensive DIY dew-proof hutch too.
http://www.iceinspace.com.au/63-446-0-0-1-0.html
I made one using the discarded Coreflute election placards. You can also find plenty big off cuts of Coreflute at Reverse Garbage in Marrickville. Picked up some acrylic sheets to make a mirror guard there too & old council banners to make scope covers too. Might find a folding table there too.