Magic bands - i know amazon and ebay have bands for sale or maybe myself or another liner can buy and send to you
Other thoughts - pins and lanyards, disney dollars or gift cards, ears or other hats, sliders and such for your magic bands. Autograph books or something for autographs
A set of coupons for souvenirs like a t shirt a plush a coffee mug
Frogg togs for hot days, a bag to carry park essentials in. A waterproof camera for water park and pool side fun.
A set of family shirts for touring like from etsy, liner pins fron zazzle.
Maybe a guide book, there are some books that have it so you write in tour travels ao it becomes a travel journal. Maybe passporters.