I ordered the Purse to Go from the company's website:
http://www.pursetogo.net/
I didn't order from eBay because I didn't see the brown colour when I did a quick search (might of missed it?) and the pricing was the same as the official site, so I just went with it. It took just over a week to arrive since I'm in Canada.
The organizer is actually really light, so no, it doesn't make the Galliera heavier at all! I would highly recommend it. The size is adjustable as well, so the jumbo will fit in a slightly smaller bag as well!