Stickers seem like a good idea because so many people put stickers on their computers and it doesn't rely on the person needing to wear the item which some may not want to do.
I know you're trying to do fewer female items, but if you do, I would suggest little metal pins like this:
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These things are fucking crack for all the non-normie women I know. They all have a collection. I have like 10 of them I didn't even buy, people just give them to me.
The pins are great because they are relatively low priced, like $10-$15. The cost adds up, but people don't notice because they are buying them as one offs. But once they have a few, they want to "add to the collection" and it's very easy to spend another $10-$15 on a pin. They wear them on jackets, bags, shirt collars etc.
I believe these are fairly easy to find a manufacturer for, based on the fact I've seen kind of young artists who don't know a lot about manufacturing making and selling these. They are probably not dropping a lot of money on huge runs off them either. Vendors at comic book and anime collections have a ton of these but they're still selling.
