You can add other colors, too, though!
I'd like to see some inexpensive (lime green and/or Disney-themed) items that could be used for gift bags for trips (luggage tags, mini flashlights, lanyards, autograph books and pens, t-shirts, sunglasses, belly bags...). You could set a minimum purchase amount if margin is an issue.
For medium- and larger-ticket items:
I like the Unofficial Guide for guide books. Walt Disney biographies would be good to offer.
How about a calendar? The customize-able T-shirts from Disney are really great (you can pick the artwork and what you want written on it). A Dis-Boards shirt would be fun. I really like the home decor stuff from Disney. Someone could collect some of the best tips and typical Q/A from the DISBoards and publish a small booklet (or all-out book). That's pretty ambitious, but I'm just brainstorming. And as I brainstorm, can you sell Entertainment Books for Orlando?
Oh! Scrapbooking supplies in lime green and in Disney themes, of course.