Speak with an attorney for a discussion of what you options might be.
With less than $500,000 to invest, even with a high unemployment area/high-employment business plan you likely wouldn't qualify for an EB-5 green card. I would normally look at an E-1/E-2 Treaty Investor/Treaty Trader visa non-immigrant (Temporary) visa, but we don't have the required treaties in place with Saudi Arabia.
There may yet be other options, especially if you own and run a business now. Speak with a lawyer for further explanations.
A great person to consult about this matter is Attorney Vincent Martin. He is highly regarded in this legal area and would be willing to discuss this matter with you.
CUNDY & MARTIN, LLC
1125 Wells Fargo Plaza
7900 Xerxes Avenue S.
Bloomington, MN 55431
Phone: (952) 746-4111
I hope this is helpful.
Urban Law Group, PLLC