buy a refurbished ipad

Sorry, I wouldn’t know that. When I purchased my refurbished MacBook Air about a year ago, I checked a couple times daily until the configuration I wanted appeared. While not exactly an efficient way of finding it, I do not know of anyway to determine when a particular product would appear.

Then supply of items at the Apple refurbished store is constantly changing, with no predetermined schedule. If you have a particular item in mind, keep checking for availability.