I live near a corporate coffee shop which offers free wireless access.
I can use there signal in the portion of my house which is nearest the
coffee shop. *If* I wanted to boost their signal so that I could use
it throughout my house, what is the best way?

I could setup a proxy in that part of the host, but I would prefer a
"store bought" solution. A quick search of Google for wireless range
extender and wireless signal amplifier does not lead to productive
results. Any ideas?

Thanks

Brock