I hadn't kept track of current prices, but I'm not surprised FP100C brings that.
I cleared mine out in 2018 and was getting $50/pack for it then(I figured I'd rather sell and buy more film than use something that was more a curiosity to me). The last few shots I took with it were definitely showing a bit of color shift compared to when it was in date, and that was only ~2 years past expiration for film that was bought quite literally from a just-arrived shipment at Freestyle and refrigerated from the day it arrived at my house.
Aside from that, though, nearly 10 years out from the last production, I'd be skeptical of anything available now. Even if the film is still capable of rendering an image, I've had 10 year old film(granted with unknown storage-I bought it second hand) where the chemical pod turned to powder when it was pulled. I've had others where the it had thickened/congealed enough that I got an image but the spread was definitely uneven.
One step film seems a BIT better in that regard than peel-apart, at least on my anedotal experience. Back in 1997 or so, quite literally when I was in elementary school still, I had an SX-70(one of the gray plastic ones, not the SLR folders) that I was actually thrilled to find I could get film for. Not too long after I got it, our local KMart I guess decided to stop carrying SX-70 and marked their existing stock to something like 50¢ a pack, and I scraped up the meagher allowance money I had(with a bit of kick in from my dad) and bought all 15 or so packs on the shelf. I still had some of that in ~2003 when I chanced into an SX70 SLR, and it all worked fine and kept working for the next year or two while I used up the last of it.
I just wish back in those days I'd had a concept of buying film at a real camera store and not just what was available at KMart/Wal-Mart/Rite-Aid. My real interest back then was instant cameras, going back to a Polaroid 210 I was given when I was 3 or 4. I actually didn't get to use that camera until quite a few years later(and I think I even still have part of a pack of FP100C in it) because I thought film wasn't available for it. Little did I know that even then, back in the early 90s, I could have found Polaroid roll film if I'd looked hard enough for it.