My idea is to capitalize on the BRRR method to buy multiple homes without investing more money.Is it possible to buy a home in a decent market (either a foreclosure or short sale or something) that has an after repair value of $100,000 for $50,000 before repairs?

Apart from finding high cap rates and being okay with being in debt up to your eyeballs, are there any other methods of growing quickly?

@Sean Gallagher,1. a 1031 always starts with the sale of a piece of investment real estate (type is not important just that it be investment and held for productive use in business trade or investment).2. 

Since there are so many different ways of real estate read up a little on each method once you find which one makes the most sense and peaks your interest then jump in and start taking action.

Correct me if im wrong or it isnt feasible to rely on the initial capital for future investments as much as I would hope it can.It seems the ideal situation/strategy is the BRRRR method where you can buy, rehab (to increase the value of the house), rent, refinance to get as much of your initial capital cash out in order to repeat the process.  

Or full price for trade into bigger deal. 

@John Suralik  subject too is a very old and easy method of acquiring RE its not big deal. what it is is uber risky for sellers unless the sellers have already lost their credit and don't care and are walking.. the reason is you take Title subject too  the existing loan.. remember loans stay in place unless paid off and even though all debt instruments have alienation clauses they are rarely envoked.

Maybe, just maybe, you don't have to pull permits if you are sourcing all those trades.

What is the best method to use for looking up pre-foreclosures and foreclosures?

I'm honestly not in need currently, so information about any trade would be fine.