Can you transfer the balance to an intro-rate 0% APR card and then throw every extra dollar at it until it's paid off?

The high interest company also charges a lot of additional fees ($1795 underwriting fee, $500 application fee, $400 appraisal, and a large “origination fee”)The only convenience is that I can get a pre-appraisal before even purchasing the subject property.

And then for the rehab, I would apply for 0% APR >15 months and use that card to pay all your labor and materials for the renovation. 

UPdate: got the APR to 5% with $2500 origination fee.

At the same time, I started to the process with Better Mortgage (Roofstock’s preferred lender) on this property (I had already received a pre-approval from them before offering on properties).

There's a bank in my area now offering 80% LTV, no points, $500 loan fee, and between 10-30 years fixed rate commercial loans at 4.75% APR. 

Assuming I buy at listing price and have a 4.5% APR on my mortgage there is no money left over (no cash flow) after accounting for vacancy and maintenance savings/expenses. (8% vacancy and 1% of 250k for maintenance) Long term this makes sense as upon sale of the house after 10-15 years I would get around 8-10% Annualized ROI assuming I sell at 250k.

Not sure it's going to be worth it for us to pay for a pre-construction appraisal (i've never even heard of this, to be honest), but I appreciate the suggestion.

My husband is active duty, and we qualify for VA loan. 30-year fixed.Currently, the lowest rate we have received for pre-approval is 3.5% interest rate with 3.743% APR.

I am going to talk to a pre foreclosure this morning and have a Colorado state gov issued buyer seller contract.