up for grabs

up for grabs (free to be taken by anyone; available and whoever is first or is successful will get it) — еще можно достать (выиграть, раздобыть); еще есть; разыгрывается; бесхозный - бери кто может

Example 1: The state's senate seat will be up for grabs in the next election. (Cambridge Dictionary of American Idioms)

Example 2: "Are all of the seats taken" — "No. Some are still up for grabs."

Example 3: "Yes, a few seats are still up for grabs, but you had better act quickly. They're being taken fast."

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You must act quickly if you want to get the thing that is up for grabs, because it could be grabbed by anyone.
GoEnglish.com

cf
[go begging]
[бесхозный]