Screw these folding table legs to a piece of 3/4" plywood About $75 or $80 when your done.
2 of these tables , They are sold by Target and may have ship to store. About $150.
The folding legs hinges meant for use with say 2 x 2 lumber are not inexpensive either.
Search craigslist for a folding banquet table like Daz put up (30" x 8') and screw a piece of 1/2" plywood to the top.
There are 34-34 1/2" plastic square tables that is would fit on. But, two of those are only almost 6' long and cost the same as other options.
The HomeStores will cut the lumber for you. Build the table with legs that remove the screws. You need a screw/drill tool and a some deck screws.