Tinlade 24 Pcs Flamingo Ostrich Novelty Pens Funny Fluffy Flamingo Pen for Adults, Feather Plastic Signing Ballpoint for Birthday Easter Basket Christmas Stocking Stuffers(Blue Ink)

Personally, get a nice pen or two for yourself, and get novelty pens for customers. they'll still steal crappy BIC crystals but a shitty pen that's also SUPER obvious/noticeable has always lasted me longer in the hands of guests. EDIT: these, or these specifically are the ones I used to buy. second option is more stealable, but only 40c each, and I would occaisionally give them to kids/teens on purpose if they really liked them. still got stolen less though. you can also tape fake flowers at the end of cheap bics like they do at doctors offices