Team Estrogen is the obvious answer for at least some of the things you mentioned. They don't carry pedals, however.

I've had good luck with any number of other retailers: Performance, Nashbar, Jenson USA, Trisports, REI and Speedgoat just to name a few. I ususually Google whatever item I'm looking for to see who offers the best price and shipping. I've yet to run into any serious problems.