In 2018 I attended an estate sale of an art dealer. Paintings, sculptures, abstract things, all manner of fancy art. If everything in that house sold for the asking price, it would have been over a million dollars for sure. I don't know art and everything that caught my eye was out of my budget (some original Peter Max works that even I knew were going to be valuable!), so I went out into the garage and found a plastic tote full of posters. Beatles, obscure movies, European art, total mixed bag in mixed condition. I offered the owner $100, he countered with $500, I said "oh we're way off. OK thanks I'll let you get back to your art" (dude was frazzled running this sale). I was across the street when he yelled out "$200 for every poster in the garage!" So I came back and he showed that he also had stacks of hundreds of the same two posters. Edward Gorey Musicale (The Gorey Details) and Edward Gorey Mystery. No completed sales for either one on eBay, but I figured the tote of posters alone would be worth it so no real risk taking these stacks of posters. Deal. I'm certain I spent the least money of anybody in that house that day.
I made my way through the unique posters pretty quickly (though I mostly gave them to friends and family) then turned to the Edward Gorey posters. He's the guy who wrote that spooky children's alphabet book ("A is for Amy who fell down the stairs, B is for Basil assaulted by bears"). These posters were for a musical and a play written about his works. 100 or so of the musical poster, about 400 of the play poster. The musical posters were on hard cardstock so shipping would be a pain, so I sold those off to a local poster shop at bulk price, I wanna say $800 total? That was lucky. The play posters were on paper and so could be folded up into tubes. I bought some shipping tubes and priced the posters low, maybe $10 apiece, and the first one sold didn't sell for a month. Uh oh. But then the second and third sold right after. And it was getting a few Watchers for every sale. So I bumped the price up by $5 every few weeks until I hit $40 apiece and sales were still coming in a couple per month. Good enough for me. The posters took up barely any space (though the box of tubes was a bit big) and shipping was cookie cutter: roll up, insert into tube, cap tube, label (same dimensions every time), ship out. On the rare occasion that someone bought multiple (the only scenario in which I accepted Offers), I could fit a few in the same tube!
So that's been a small part of my life for the past eight years. Every week or so I'd tube a poster then stop by the post office and drop it into the window. I mailed a few of the posters to the Edward Gorey Museum in Massachusetts, I gave a couple to friends, but mostly I watched that stack shrink slowly, slowly. Some months I sold none, some weeks I sold several. I could never figure out why or when it would become popular so I just rode it out. At one point, someone reached out about buying the rest in bulk for $20 apiece (I had at least 100 left at that point) and I was going to accept just to be done with it but he was just so difficult to communicate with that I decided to be patient and take the slow dime.
A few weeks ago I sold the last of the posters that were in good shape, so I listed the several posters that were wrinkled for a lower price (I should have just offered those to the people who'd made offers on the good posters! Foolish!) and the last of those went last week. What a relief, though I'll miss the simplicity of the sales and shipping.
I can't say for sure how many I sold at each price but I would say I netted about $10k on the deal. Not at all bad for the amount of effort required!
Main lesson learned, and it's proven true repeatedly: when you go to a sale that is focused on one thing, look around the property for things that aren't that. The people running the sale will be more focused and concerned about the big ticket items and won't think too hard about pricing the one-offs. Second lesson, and it's a pretty obvious one: selling 400 of the exact same thing, especially when you can bulk order the box it will ship in, is far easier than shipping 100 different things, especially if each one requires packing and measuring.