Financing problem

Beginning house flipper (just completed and sold my 3rd one) looking at what could be “the” homerun deal. Foreclosed home on market for 7 months now. price originally started in high 500’s, now down to 420K. Haven’t been inside house, haven’t looked comps (guessing it will go for low to mid 700. I want to buy and live in it while fixing it up. If I got it for, say 350 cash offer, I have 100K to put in myself. Any suggestions where to come up with the other 250K, with the idea being I will live in the house until it sells, which could be a year to a year and a half due to the price range and area.

Question? this really the bargain you think it is?

Recently looked at foreclosed house initially on market for 279K, came down, after about a year, to 150K. Looked at inside and PASSED.

All that glitters is not GOLD.