The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

My previous endeavors have been buying smalls (store closing inventory, etc.) and reselling for profit.

Open a Flooring store called Big Bobs Flooring at 20 and still running the shop and selling flooring. 

I can go through 2-3 check books per house on top of the countless purchases from different stores on the debit card.

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

I would also buy the materials as they are needed and store them yourself to minimize the risk of theft.  

If you call the store manager of any big box store and tell him your business is rehabbing apartments and you would like to start a purchase arrangement with his store, you can expect 10-15% discounts off of the shelf price.