Not everything is locked behind a paywall. If you search for hoping for free items, focus on these:
If a friend owns a map, you can join them for free.
: Check your platform's store (Steam, Epic, or Xbox) for "Free DLC" packs regularly released by the developers to enhance the base game . How to Unlock Purchased DLC In-Game
Valve allows developers to flag DLC as “Buy on Demand.” You can use a command to force Steam to download the files for items you don't own so you can test them in Single Player (though you cannot equip them without owning them unless using a specific legacy loophole for weapon packs).
You cannot host the map yourself, and you won’t have access to the specific DLC weapons or gear associated with that pack unless you purchase it. 2. Official Bundles and Sales