First come, first served — whoever arrives first or claims something gets priority; commonly used for sales, ticketing, etc.
残りわずか、早い者勝ちだよ。
Only a few left — first come, first served.
このチケットは早い者勝ちで配られます。
These tickets will be distributed on a first-come, first-served basis.
セール品は早い者勝ちなので、迷わず買った方がいい。
Sale items are first come, first served, so it's better to buy without hesitation.
応募は先着順で、早い者勝ちとなります。
Applications are on a first-come, first-served basis; whoever is early wins.