Last Friday I was quoted 2.5% for conventional under $510K and 2.875% for over 510K. Including loan depot and other two lenders.
This week it's above 3%. I think you should wait a few days.
http://www.mortgagenewsdaily.com/mortgage_rates/daily.aspx
From this link you can see rate is not absolutely at the bottom. see daily mortgage rate table, and 30 YEAR FRM column.