Having initial conversations with a $1M ebitda long-standing business, likely price of $2.5M and I'll put $500-1M cash upfront. I'd like to line up options for financing aside from SBA in order to move quickly when/if the time comes. I've heard there's a lower bound of when a commercial bank would be interested in lending, but unsure of that minimum. Also, I know there are newer/alternative providers of debt financing.

What are the top few options I can be lining up to be ready / compare?

Thank you for any guidance!