http://flytrapranch.com/ has a few in stock every so often, you'd have to catch them as they come up.

I believe I got mine from Cook's Carnivorous Plants:
http://www.flytraps.com/

... and they have a few in stock.

There are also other big verities, such as "Big Mouth", "Big Vigorous", etc etc.

Well i'm offering the South West Giant and the G14 Dirk Ventham's Giant plants on my website at http://www.phongvft.org If you guys are interested.

The B52 does look like it's a nice plant. Wish I had a chance to grow that plant. However, I think in terms of trap coloration, I have yet to see a VFT best the G14.

Here is a link that might be useful: VFT's