We use a Lifetime Commercial grade plastic table from Costco. It's very sturdy, and the legs adjust to several different heights. It's also quite reasonably priced.
http://www.costco.com/Browse/Product...=P_CatalogName:BC&Sp=S&N=4000487&whse=BC&Dx=mode+matchallpartial&Ntk=Text_Search&Dr=P_CatalogName:BC&Ne=4000000&D=tables&Ntt=tables&No=25&Ntx=mode+matchallpartial&s=1&topnav=&Nty=1&s=1