I haven't seen it in Bangkok, but I have seen it sold in Vientiane, Laos. They sell it at the Swedish Bakery in Vientiane. No joke! They keep it in a refrigerator. I forget the name of the bakery, but its the only Swedish Bakery right next to the big famous fountain called Nam Phou. They also serve an amazing croissant sandwich, juice, and coffee combo for about 100 Baht or 28,000 Kip.