Backorders keep a sale you would otherwise lose, but they tie up the buyer's money and patience. Many research stores prefer a back-in-stock alert, which lets the buyer order when the batch is actually released.
Backorder
An order taken for a product that is out of stock, to be shipped when stock returns.
See it running on your own catalog
Purity does the work these terms describe: batches held until their lab report is in, payments matched to orders, and wording checked before it sends.