Back when I first joined this forum in 2023, there were about 10 OV-15s for sale as a lot, for $50 on Marketplace. Didn't know their value (and didn't want to ask my mom to drive me there) so they went to someone else.
Regarding ReStores, probably a 250w Philips-Westinghouse lamp that had a cracked base and was in the wrong sleeve. I wound up getting a Mexican LEDVANCE 250w because it looked newer.

ReStores also had a couple of very unique mercury floods at one point. I saw the line and passed on them. $5/each, I believe they were GE. As well as 2x2 and 2x4 LED drop-ceiling lights. They were GE and not the disposable flat panel type. Those were $5/each also, and were gone by my next visit.
Otherwise, I'd say I'm pretty lucky with my finds. I already have an OV-15, OV-25, a LM Unistyle 175 (thanks
@Cfl3028 ), and now a McGraw-Edison Unidor 400 in MV, aka the rarest variant.