No, you cannot buy all case keys in CSGO anymore. As of October 2019, Valve removed the ability to purchase case keys directly from the in-game store. This change was implemented to combat fraud and money laundering activities within the CSGO economy.

Currently, the only way to obtain CSGO case keys is through the Steam Community Market, where other players sell their existing keys. However, these keys can only be used to open cases acquired before the update (known as pre-existing cases).

For newer cases released after October 2019, you don't need keys at all. Instead, these cases use a direct purchase system where you can open them by paying a fixed price (usually around $2.50) directly through the game client.

If you're looking to open cases, here are your options:

1. Buy pre-existing keys from the Steam Market for old cases
2. Use the direct purchase system for newer cases
3. Buy already opened items directly from the Steam Market

It's important to note that any keys purchased before the update can still be used, traded, and sold on the Steam Market. However, these keys are becoming increasingly rare and often sell for higher prices than their original cost.

The removal of purchasable keys has significantly changed how the CSGO case opening system works, making it more straightforward but also limiting options for older cases. If you're interested in opening cases, I recommend focusing on newer ones that use the direct purchase system, as they're generally more accessible and have a more transparent pricing structure.

Remember that all case openings, regardless of method, are subject to Steam's trading restrictions and marketplace regulations. Always ensure you're using official Steam channels for any transactions to avoid potential scams or fraud.

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