Anyone can suggest a reputable short term lender?

My email is constantly being spammed with email lenders, which don't seem too reputable. Background: I am in the process of purchasing another business in the same industry as my business. The business I am working to purchase has one major problem, namely customer concentration. This affords me the opportunity to purchase it for well under market value. We had agreed to a 2.5x SDE multiple, with working capital to be largely seller financed (80%). But for several reasons, mostly the sellers moving too slow, I walked. The seller have enticed me back with an all cash proposal that is 1.2x SDE without working capital. I don't quite have enough cash to complete the transaction without borrowing at least $100K up to $250K. What are my options for short term loans? I should be able to pay it back with interest in 1 year. Ideally the loan would not start repayment for a couple of months, is that even an option?