I bought these stones and used them for a short while until I obtained a set of Shapton stones, which became my "go-to" sharpening stones.
Amazon has these new at $60 for the Medium, $71 for the Fine, and $105 for the Ultra-Fine, for a total of $236 for the set. I'll sell them for $125 plus shipping. Probably the lowest cost shipping is a small flat rate box (I think they'll fit in that).
Payment by Zelle, Venmo, check, cash or any other non-fee payment system.
I have my name in pencil on the side of the Fine and Ultra-Fine but you should be able to remove that.