Slot Machine Jackpot sound effects, royalty-free and cleared for commercial work. 3 libraries carry this tag, most of them filed under Game Audio Bundles and Miscellaneous.
Recordists here also tag Click, Bell and Coin, which is worth a look if nothing below fits.
Professional quality collection featuring 420 casino-themed sound effects, including mechanical reels, button clicks, win alarms, and ambient loops in MP3 and WAV formats for slot game development.
Modern slot machine sounds and effects collection featuring 430 audio assets, including reel spins, interface buttons, win tunes, and payout sounds in both WAV and MP3 formats.