So you want a pump to use at home, or for mounting on the bike? Because if it's for filling up tires at home,
...or any power inflator that uses batteries you already have. If you don't have any cordless tools, the Ryobi route is the cheapest. The inflator is $20, you can get a battery for $25, and a charger for $25. Comes with an excuse to buy any number of other 18V cordless tools.