There are four main custom chips in the Atari 8-bit family. The ANTIC, GTIA, SALLY and POKEY. The PIA was a common industry chip. My question is, in 2017, how readily available are these to buy without having to buy a whole computer and canalizing it for parts? I've notice that either B&C and/or Best is pulling the POKEYs off boards and selling them at a premium (~$20). ANTICs in the 400/800/1200XL are 7 bitters and the 600/800XL/XE have 8 bitters. GTIA appears to be unchanged. As for the SALLY (6502C), those were found in the 400/800/XLs/XEs. The 400/800 CPU boards with SALLYs have a different PCB with less chips. I see them on eBay, but are we getting close like so many other Atari parts to exhausting the supplies? There are a lot of parts for the 400/800 and XLs that are no longer readily available and there typically is no warning. Just an update from Best saying (SOLD OUT).