I can't find specific examples, but I'm almost certain they have at some points in the past adjusted pricing of upgrades mid-cycle.
Apple raised iPad Pro prices in 2017 by $50 to address NAND memory chips price hikes from the vendors: https://www.cnbc.com/2017/09/13/ipad-pro-price-increase.html
Apple raised iPad Pro prices in 2017 by $50 to address NAND memory chips price hikes from the vendors: https://www.cnbc.com/2017/09/13/ipad-pro-price-increase.html