using a TREC 1-4 contract so hard to scam there.  

Quote from @Stuart Udis: You can also reduce your transactional costs by using a bank construction to permanent loan with an earn out.

Using a self-directed Roth IRA offers tax-advantaged growth, but choosing the right account type is essential.

I suggest using a service like Mayistay.

As others have stated using a VA loan gives you quite an advantage to get into the deal. 

My favorite way is is simply using Pricelabs using a comp set, OR using Airbnb itself to see what your direct competition is.

Hi Joe,Using a Home Equity Line of Credit (HELOC) on your primary residence can be a practical and low-cost way to fund flips, especially since the terms you mentioned include only a $200 yearly fee.

We were using a 4th (not on your list) but I cannot recommend them. 

Using a heloc as 1st mortgage really only has a major benefit if you have idol cash sitting around from your paychecks. 

I am looking to buy into one of their offerings in the near future using a SDIRA.