There are quite a few other options that you should consider before walking away, though.It sounds like maybe a fix-and-flip loan would be a viable option for you.

You can look up cash buyers on propwire free, and reach out to the LLC owners by looking them up, or call the agent and ask them.Another option would be to find some private money lenders, and get them to go down on a hard money loan with you, unless you can get all the capital from one person alone (this is very difficult because most people won't loan that much to someone new to real estate). 

: Depends on how you will qualify for the loan.

. , like this one, its saying 1.3M, what would the downpayment be needed for this, what type of loan would I be looking for? 

What are my best options for loans?

Since the sellers are opposed to seller financing, consider exploring alternative financing options such as traditional bank loans, private lenders, or hard money lenders.

After spending thousands of dollars, I had to get someone else to fund my loan.

so in the eyes of an underwriter, when I take out my next loan, will they see this as a loss?

I currently do not have any student loans, car payments or other debts besides my mortgage. 

I have educated myself on 2-4 unit duplex/multifamily with the hopes to live in one and do a 3.5% FHA loan and then resell after a year.