Em, I've signed up for "Daily Baby Buys", apparently every now and then Vanchi bags come up as the daily deal on there. BUT I was speaking to the Vanchi guy at the Expo on Saturday and he said that you can't guarantee when they will appear, nor which type. He said they use it to offload excess stock. So if you are happy to wait and try your luck with when and what might appear, that's a good place. A few people from here have successfully gotten them from there, quite cheap.

Don't know where else!