Gift for my photographer bf

Hello! I’m trying to think of a good Xmas gift for my boyfriend. He lives and breathes film photography. He shoots 35, medium format and has recently dabbled in slide. He develops and scans his own negatives at home so he basically has everything. He’s tried so many film stocks, even obscure ones and has about 4 cameras in rotation right now. Is there anything fun or out of the box that I could add to his collection that would be around $100 or less? Even if it’s kind of a novelty, just something that he would get a kick out of. Or something genuinely useful or cool to try out if you can think of anything. Thanks!