We just successfully closed on our home in Wyoming yesterday with Compass Bank.
We asked the seller's to pay 3% closing costs on our $360k home. That translated to $10,800. It turned out that all the prepaids and other closing costs were only 3k. We didn't want to give the seller all that extra cash. So, we used the leftover money to buy down the rate. We ended up having the sellers pay 2 points (2% of purchase price). Original rate was 5.75%... our 2 points bought us 4.75%. So, if I'm doing the math right, each point bought 0.5%. FYI- you can do half points too. We almost did 1.5 points. I hope this helps.