Home Depot sells
these tables.
***Full Disclosure: I work for Home Depot***
That being said (and before I ever considered working there), my parents bought a couple of these tables. They've had them for a few years now and they've been very stable and durable. We've mainly used the tables for outdoor cookouts and for holding heavy catering-style trays, etc.
The only thing you might also want to look into is a toolcase/table combo, such as
this offering from Audiopile. You could store your mics, cables, etc. in there and just roll it in to the venue.