-raises hand- I have experience with out of country betta deals. Its never good to order from a breeder in Thailand or Indonesia unless they have a transshipper. The transshipper handles all the mess of paper work and sorting out fees, and gets a chance to take the fish out of its package to place it in a clean tank to rest. Once everything is ready they send you the fish. The transshipper I've worked with is Jennifer Viveiros(hopdiggity@bellsouth.net). She works with quite a few international betta breeders and she is very friendly and knows her stuff. I don't believe she is currently doing to much work due to having kids but she has a nice little article for you and links to breeders pages on her website.
Transshipping Info1 Transshipping Info2As for estimated cost. In most cases, your basically paying shipping x2. Once to the transshipper and then once to your own home. Its really not worth it unless you are breeding, like I was, or unless you are buying in bulk, like pet stores.
That being said, I don't know anything about the breeder of the fish you have posted so I can't give insight on weather or not they are any good. Fortunately that color isn't hard to find internationally. Its generally labeled "Devil" "Red Devil" "Metalic Black" "Black Devil" or "Monster" However, I have seen this color show up at nnnn before so keep an eye out if your nnnn sells CTs before you make the jump to purchasing out of the country.