Publisher stand alone

Microsoft no longer sells Publisher as a standalone product on its primary storefront, but you should be able to purchase the Microsoft Office Professional 2021 suite, which is a one-time purchase that includes Publisher alongside the core apps like Word and Excel. You can still find legitimate retail keys from authorized third-party sellers and established tech retailers like CDW (https://www.cdw.com/product/microsoft-publisher-ltsc-2021-license-1-license/6722871) or My Choice Software (https://www.mychoicesoftware.com/products/microsoft-office-2021-professional-digital-download), where prices for the full suite often range between $200 and $400 depending on the specific licensing terms. Some specialized software vendors like Digital License(https://digitallicense.shop/microsoft-publisher-2021/) and FastSoftwares (https://www.fastsoftwares.com/product/microsoft-publisher-2021/) still list individual keys for Publisher 2021 specifically, often at a lower price point around $50 to $100, though you should verify their current stock and activation guarantees before buying. Be careful with extremely low-priced "lifetime" deals on unfamiliar sites, as these are often volume licenses not intended for individual resale and may be deactivated by Microsoft later.

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hth

Marcin