I'm sorry I can't answer your question about where to buy one with a PayPal account, but I do want to make sure you are aware of what you are planning to order.
The Streamlight ProPolymer LED is different from
the Streamlight ProPolymer Luxeon.
The Luxeon version is newer and *much* brighter but with a shorter run time. Many places carry the LED version, but I've only seen a few that have the Luxeon one.
If you find a site that takes PayPal, make sure they also sell the correct version of the light that you want!
-Brian