A way to take advantage of buying a house that currently has a low interest rate?

[Mike Hoang]

All, 

Ran into several people who are interested in selling their houses, but are choosing not to sell because they have really good interest rates on them. If they bought a new house, they wouldn't have a chance to get anywhere near the same rate.

Does anyone have any creative financing strategies to somehow keep the good interest rate when buying a new house or me taking advantage of their good interest rate when buying the house from them?