You should check via google, all shopping sites, to find any. It is currently out-of-stock in most places. You could place an order and hope it is delivered in a timeframe to suit your needs, or search eBay for used ones, or hedge your bets and order from several places (some sellers will only sell in quantities of 1 or 2 anyway, so buying 10 in one go could be out of the question with some stores), or consider a different Pi model (e.g. Pi 400, Pi 3 Model A+, etc., could be currently available from some sellers).
