Yeh, but they have more S-100 and pre-1980 stuff than they can display or store already. The newest item they have is a 20th Aniv. Mac, the next newest is an original NeXT cube. They look on G4s as low-end systems for resale, or scrap. At one point they had 30 iMac G3s out for $10, and when they didn't move they were scrapped (except for the pick of the litter I took home and fixed up). There are a few jewels in with the 250 tons of Dells and HPs that pass through every week. It's a good place to find 512MB PC133 RAM, or G4 upgrades. This week the Apple items that caught my eye were a Quicktake 150 and a Snow Airport Base Station at $20 ea. I already have one of each, so I resisted. The oldies corner this week had an Amiga 1000, a TI-99/4, and a Woz edition GS for sale.
I run Tiger 10.4.11 on my 500 MHz slot loader, and it handles it nicely.