DropLock (Free) for WooCommerce — limit a product to one (or N) per customer across all of their orders, not just one cart.
WooCommerce's built-in "Sold individually" only caps a single cart; a customer can check out again and buy more. DropLock enforces a true lifetime per-customer limit, matching logged-in customers by user ID and guests by billing email, validated at add-to-cart, cart update, and checkout.
This free edition
- Protects one product with a lifetime per-customer limit
- Default limit message + product badge
- Recent blocked-attempt log (last 5)
- HPOS + Cart/Checkout Blocks compatible
- Admin/shop-manager bypass
Need more?
DropLock Pro adds unlimited products, editable messages/badges, configurable counted statuses, a full exportable log, and (in 1.1) per-variation limits, category limits, sale-only limits, and disposable-email blocking → https://droplockwp.com
GPL-2.0-or-later. Install: upload the zip via Plugins → Add New → Upload Plugin.