For me it was a spindle of double layer DVD-R discs.
I miss Fry's store #3 in Palo Alto, lots of fond memories going there as a kid in the 90s.
I still have my first purchase from when they opened locally in Tempe-- a 14" "Voxon" brand 1024x768-capable CRT monitor.
I had built a 386DX/40 out of cast-off parts and upgrades-- a real freak box with two MFM hard drives and an EGA card-- and sold it for $150 to finance getting a colour screen for my "personal" machine (the family had a new, but terrible Packard Bell Pentium, and I had a 286 I was progressively upgrading-- 386/40, then 486/33, then overclock to 40, for my personal use) I held out for a few months trying to find one at a thrift shop since $150 is a lot of money for a mid-90s teenager, but eventually saw them offering them as store-opening loss leaders. When I got there, the one they promoted was sold out-- I think it was the "US Logic" brand you saw on a bunch of cheap monitors at the time, so they offered a different one with pots rather than digital picture controls, but I preferred that. Hasn't been plugged in in a long time, probably all sorts of dead.
We got a camcorder and a headphones, 100s of blank CDs, and I think a Walkman. Great times. I cherish those days so much.
I visited that store in Palo Alto once when I went to a conference at Stanford, I was just walking around and bumped into it. Didn't actually buy anything.
What a boring, soulless store. The inventory was interesting but that was about it. At least we still have MicroCenter.