My favorite part of going to expos, conventions, and the like, is all the stupid swag I can collect. And as a business owner I get sample promo items in the mail all the time. My favorite is the pens that have my company name spelled wrong, or better yet, since it is a long name, they run out of letters and leave the last one off. And they expect me to buy something...
My wife gets promotional items every year as a gag at my expense. She has a caricature drawing of my face, so she puts that on stuff. One year was round erasers, like half dollar size, that said "Mistakes, I;ve made a few". She has given out chip clips with my face several times. She has vegetable peelers that say I am appealing. Har har. Plastic spatulas, even a flexible chopping mat with me saying "ow-ow-ow-ow-ow" on it.
Anyway, things like that come from promotions companies, and the one she likes to deal with is Motivators. They have everything from really cheap little items up to executive gifts. You know, a desk clock with a sailing ship on it... or whatever. I used to deal with a company locally to make various lapel buttons and such and was very happy, but there are so many places online these days. The wife likes dealing with the reps there, and once she approved the art, the goods always came within 10 days. Never been displeased. And I will say the peelers work pretty well. The hacky sacks, well I never play that, but they do appear to be sturdy. Big plastic drinking cups with my face, even tote bags that say "Here let me carry that for you". I realize those specific items won;t fit in a pickup box, but ideas are ideas, and who knows what may come of them.
Promotional Products & Custom Printed Items | Motivators
I don't know your company attitude, but I like humorous swag myself, even if it is stupid. Like the little 6 inch rulers that say something like "Does your pickup measure up?" Note pads titled "Set List" and the first song is already printed there as "Free Bird". My wife gave out little magnetic dry erase boards titled Things to Do, with #1 being "Hire a divorce lawyer" printed on it.
Picks are easy to get. DO your pickups adjust? How about a little screwdriver or allen wrench or whatefer they need, with your name on it.
here's a stupid idea, use shredded paper as packing material, and make some reference to "our pickups really shred." Or something.
How about neck wiping cloths? Fret wax? Those tiny bottles of Tabasco sauce, because these pickups are HOT. yes, I am a hack at ad writing. Fridge magnets.
I don;t like pens much, cheap ball points write like cheap ball points. I am spoiled, I only buy gel pens any more. The Pilot G-2 is my choice.
I hope any of that is useful at some level.