Second Amazon/eBay, but I only buy new or pristine CD's nowadays because my Cambridge Audio CXC transport hiccups at the very hint of a scratch or scuff, whereas my Oppo BDP-103 would play with nearly a complaint (AND it played SACD's, too!).
Where do you buy your CDs these days?
I'm curious what online sites folks use to find CDs? I use Amazon, and especially their Marketplace sellers for used discs. But prices have become high and supply has become stagnant. I used to use several European retailers (Amazon UK and Presto) before the pandemic, but shipping is extremely slow these days and I've had more than one never show up at all and presumed lost. Surely there are other online retailers?