The lowest price, ebikestop, sounds familiar, that's probably where I got mine. But that's not even a dollar cheaper than aebike, hardly worth it. I vote for aebike.
Especially since ebikestop is charging shipping. Shipping free at aebike.
Also, here's some more tips for finding cheap stuffs in addition to google shopping:
www.qbike.com (bike specific price search)
www.spadout.com (sporting goods price search)
www.retailmenot.com (for coupons)
www.niagaracycle.com (doesn't show up in many searches, but generally has cheap prices and uninflated shipping)
www.universalcycles.com (instant price match)