Mortgage rates had a good little run there. Rates hit the lowest point in weeks for a bit, but things have gone worse, especially today. This graph shows from March 1st, to today April 3rd. Red is bad, green is good.
I always tell people that they can have any rate that they want. I priced this scenario with no extra cost for the rate, and no lender credit. If you wanted to pay about 1% of the loan amount towards a discount in the rate, you'd be looking at 4.250% (4.354% APR).
Each scenario will be different. Please let me know if you'd like me to run a scenario for you!