Wal-Mart is a store never seen but frequently mentioned on Inanimate Insanity. It is stated to be the store that "has everything", and given how many items that the characters have purchased from it, this has basically proven to be true. Marshmallow is the most frequent buyer of Wal-Mart products (and has owned a Rewards card), followed by Paintbrush.
The store and the products it sells can be used as a deus ex machina for the contestants. (A deus ex machina being whereby a seemingly unsolvable problem is suddenly and abruptly solved with the contrived and unexpected intervention of some new event, character, ability, or object.) So far, a remote that activates a launchpad that came with a free cucumber, a time machine, a dummy resembling MePhone4, a big shiny aluminum tree, and a boat have been bought from Wal-Mart.
The episode War De Guacamole marks the first mention of Wal-Mart. The beginning of the episode shows Knife talking to Nickel and OJ, asking them if they wanted to see the wonders of static electricity. Knife then sneaks up on Marshmallow and shocks her. Knife, Nickel and OJ laugh at Marshmallow as Knife points out that it is she is "so much fun to mess with".Marshmallow responds "Yeah, so are you!" and presses a button, releasing an orange launch pad from where Knife was standing, throwing him far over a cliff. Nickel asks where she got her launch pad, and she responds that she got it from Wal-Mart and that it came with a free cucumber. Pickle suddenly appears and takes the cucumber caringly.
In 4seeing The Future, OJ starts to tell Marshmallow and Taco about his hatred towards MePhone4S, and how he wanted MePhone4 back. Marshmallow then reveals that maybe they can get him back since she has a time machine that she got from Wal-Mart. She presses a button and the three vanish. They appear on November 30th, The Day of MePhone4's Death. They appear behind a bush as Marshmallow gives her idea to OJ, which was that she will pause time with her time machine as OJ replaces MePhone4 with a dummy that she got from Wal-Mart. OJ comments that Wal-Mart seems to have everything, which Marsh agrees to, but then orders OJ to complete the mission. MePhone4S then fires his gun, just like before, but the bullet is then paused in mid-air in front of MePhone4, as OJ grabs him and replaces him with the dummy. Marshmallow watches nearby as her plan starts to work. Without these two Wal-Mart products, MePhone4 would have remained dead and so MePhone4S would have remained the host.
In The Snowdown, after Marshmallow realized that Team Epic had no tree, Paintbrush left the scene. He/she later returns with an aluminum tree bought from Wal-Mart, saying it may be last minute, but it works. This shows that Marshmallow 's love of Wal-Mart has somewhat rubbed off on her friend Paintbrush. Paintbrush said that his/her tree was perfect, but MePhone4 announced the winning team to be Team Chickenleg, much to Paintbrush's surprise and disgust. He/she yelled that his/her tree was way better and that MePhone4 was a complete idiot. MePhone4 explained that Christmas trees should show Christmas spirit, and that his/her big, shiny aluminum tree shows commercialism, when it should evoke a feeling of hope, good will, and joy, because that's what Christmas is all about. Paintbrush yelled that he/she didn't care about any of this.
In Aquatic Conflict, Paper uses a boat for him and OJ in the underwater challenge as they cannot swim that he got from Wal-Mart. He claims that everyone shops there now. Also during the challenge, Apple reveals to Marshmallow that she has stolen her Wal-Mart Rewards card, and as payback for the various mean things she's done to her, she tears it in half. Marshmallow angrily calls Apple a monster for her actions.
In it's last mention, In Journey Through Memorey Lane, During OJ's riddle from Tyler, he replies that Wal-Mart is the thing everyone needs since they've got everything. Tyler then says it sure does.
During OJ's speech to his friends, he says that nothing is more important than friendship, to which Tyler comes in and makes OJ add 'and Wal-Mart'.