Bass Pro Shops, Cabela's and Amazon.com are some retailers that carry portable shooting tables, as of 2015. Some of the tables fold up for transportation, while others require disassembly. Some of the retailers also sell tote bags and carrying cases for the shooting tables.
Bass Pro Shops has several different styles of shooting tables available, including the collapsible RangeMaxx shooting table and the Muddy swivel-action table. Both tables have adjustable heights and attached seats.
Cabela's carries the Caldwell Stable Table and the Big Game swivel-action shooting bench. The company also has its own brand of bench bag set for carrying the disassembled units.
The MTM Predator shooting table is available from Amazon.com. The table is fully collapsible but does not come with a seat.