Place it at the end of a short reaction sequence, after a Pop Sound Effect to mark the reveal and before a Nope Meme Sound to close the bit when the offer gets rejected outright.
关于此声音
A 1.6-second fan-voiced laugh performed by RochonVA in the voice of Spamton, the frantic salesman from Deltarune. The delivery is high-pitched, stuttery and over-the-top, making it feel smug, manic and a little untrustworthy, like a bad deal just got worse.