Last year I did not go to Celebrated Summer Records until the day after RSD, and they still had a few of the things on my list (but still slim pickings).
They open at 11AM, and I probably can get there by 1PM this time so I am hoping they still have a good amount of stock.
I have good record mailers (at one point I was thinking about selling off my late 90s/early 00s DJ records) and can send them off Monday. I take it everyone uses PayPal.