They are around, but never cheap. I paid around $100 for The Playing Field, but got the other red cap, The A List for about $50 so averaged $75 on the two reds. I was at Planet Hollywood very near to when they were released. Only one of the three strike machines had red caps in it, spaced ten apart. There was nothing near the bottom so I played the other two machines and did pretty well and got about a 50-50 mix of .999 and clads. I planned to hit it hard for reds two weeks later when I was coming back. I got there and there no machines anywhere. I asked slot attendant and they said they were off the floor. They said the strikes were still there, but they didn't think the machines were coming back. So I suspect the reds were in play for two weeks to a month maybe and that is why even though there were 500 minted, I'd guess (and only a guess) maybe 100-200 each max were actually won and the rest were destroyed.
I see them around every now and then, but it's been a long time since I've seen one on eBay.