I also use the PV500, it's an excellent bit of kit that fit's inside a fag packet! I use a button cam that's powered by the PV500, so no need for extra batteries etc.
I use it in a briefcase, a leather document folder, a hoodie (all without the button of course, just unscrew the button and it's a pinhole camera). I also use it with shirts etc with the button attached. All in all, it's one of the most used bits of kit I have and one of the cheapest.
I got mine from
You need to Find a Private Investigator We are the place!| Find a PI | Spy Shop | Software | PIClasses Online | they have a few models and accessories, the PV800 now has a multiplexor thing for using 4 cameras.
It's quite cheap to with the Dollar being as it is, to buy from the US, all you need to get is a travel adaptor for charging.