Hey Cayle
There are some available at these sites:
$60 https://ksarcade.net/williams-bally-wpc-asic-chip.html
$74 http://www.actionpinball.com/parts.php?item=5410-12426-01
$69 https://littleshopofgames.com/shop/electronics/circuit-board-components/williams-asic-cpu-chip-5410-12426-01-2/
$82 ebay.com link: Williams Bally Pinball ASIC WPC WPC95 ASIC CPU Chip 5410 12426 01
$65 https://www.thepinballwizard.net/integrated-circuits-cpus-and-peripherals-logic-linear-and-voltage-regulators/asic-wpc/wpc95-asic-cpu-chip-williams/bally/
$60 http://www.planetarypinball.com/mm5/merchant.mvc?Screen=PROD&Product_Code=PPS-5410-12426-01
Wally