Theera now has a web pages for custom cakes to order. There are 3 size of custom cakes: 1lb, 2lb, and 3lb depending on price. You must order minimum 3 days in advance, 7 days if you would like a fondant design.
You can order cake at Theera: The Original Healthy Bake Room at Sukhumvit 42.
Here is the website for ordering cakes: