Holy cow, just checked - $43 for 1\2" OSB, $53 for T+G 3/4" sub floor, $64 1/2" sanded plywood.
Boy I feel lucky, we have been nearing the end of about a 2yr project of turning our garage into a master bedroom suite with a bump out closet. We bought most of our real building materials in 2019 - I am fairly certain I was buying OSB for around $15 and the sub floor around $30.