I thought that also, but it doesn't hurt to ask when going to a yard sale just in case someone has, and is willing to sell, a fluorescent mineral collection at a "yard sale" price to raise money. But I agree that the fluorescent glassware has a much better chance of being found at yard sales than fluorescent minerals
As far as ebay the ones I see that have a super duper WOW factor are too pricey, like one I just looked at that has multiple colors all in one rock, including red/orange, violet-blue , green.... they want $150 plus $15 shipping, hey as super neat as it looks with a huge WOW factor, even if I had that amount available in my hobby budget I'd still have a hard time paying that much for one "rock"
I'm not saying the inexpensive ones are not really cool to look at also, but it seems like the ones that might have you looking like:
are usually very pricey. I think in order for me to buy ones from ebay that have enough of a WOW factor for me to buy might need to be on the smaller sample size, it might be possible to get one that looks really super duper at a low price if it is small enough. Hey, not a big deal since I usually look at my minerals close up anyhow and not from across the room
I just now did an ebay search for fluorescent minerals and sorted them to start with lowest price including shipping first and as of right now the lowest one was listed as:
Fluorescent Calcite Thumbnail Mineral Specimen *Sterling Mine, New Jersey*
$2.25or Best Offer+$4.50 shipping
Not a bad price at all if it wasn't for shipping, it's not easy buying something where there shipping is twice the price of the item sold
......not sure how easy to would be to find stores locally that would sell such items, but I'd love to be able to pay under $5 for a fluorescent mineral in person and avoid the shipping cost