Best/lowest-interest-rate financing without 2 years or W-2's?

[Humberto Sepulveda III]

I have quite a few clients within my COI that are professional gamblers. A few of them have cashed for 6 figures last year with a couple for even 7 figures. With that said, the best offer we've received for financing has been 30%-35% down with a 640+ credit score and proof of 12 months worth of payments. Does anybody know of a better option than this? Preferably around 10%? Client has a w-2-G (what they give you for your winnings).