Here is a list of all the official merchandise sold by Tally Hall over the years. Currently, the only official Tally Hall merchandise store only stocks one item, so for others eBay is recommended.
Music
Selections From The Upcoming Marvin's Marvelous Mechanical Museum CD
Manufactured 2005, for promotional use
Manufactured 2005, for promotional use
Solo/Side Project Music
Clothing
Side/Solo Project Clothing
Stickers
Vending Machine Prizes
Good & Evil Preorder Bonus
Along with the below items, each pre-order package came with a random selection of Tally Hall tattoos and a random photo used in the "Welcome to Tally Hall" music video.