A line of stores that prides itself on its wide selection. One was featured in the episode "Washington B.C.". It is were Dr. Animo found the remaining pieces he needed for his Transmodulator.
Mega Mart has a pet section in it.
Mega Mart also has a cereal isle filled with boxes of Sumo Slammer Cereal.
Mega Mart also has a toy section which is where Ben finds the Scooter he uses to stop the Mutant Cockatoo.