I watched a show on tv (which is where I get all of my knowledge on everything from). Anyway, the couple could barely afford the down payment. When it came to closing costs, there was no way they could meet the high price. So, they negotiated with the sellers to increase the offer price and have the sellers pick up the closing costs. The seller was not out any money, and the buyer did not have to pay the closing costs up front. Not sure if this is allowed everywhere (I think this was in Virginia) or if your seller will agree to this, but it could possibly keep you from having to pay a lot out of pocket.
Good luck, and you are lucky to be in a market where you can buy for 300K. So jealous.