Adam, I will be in Bangkok on Thursday. Last time I was there found no particular bargains looking at a number of stores in places like MBK centre and Siam centre etc. Whilst by no means a local, I found many prices more expensive than Poon, with the odd item close. A local may be able to direct you to the best place to purchase, probably much cheaper than where I was, Juztin? springs to mind.
I think we need to find the factory and see if we can get some factory door specials