hi tama_angel16!
Sorry for my late reponse....
I'll try to answer your questions if I can
Bandai is the original company in Japan (one and only). Interested investors in US wanted to have Bandai in US to cater to kids/teens/families, so they decided to buy rights from Bandai Japan to set up Bandai US. The same goes for Asia and Europe. I'm not so sure about how it came to be, so you may want to check with others for correct information.
tama folks, do correct me if the abovementioned is totally wrong.
Bandai US only distribute within US only. That's why Bandai Asia (thailand, taiwan, singapore, malaysia, etc) is developed to handle Bandai products for asian countries. So if you email Bandai US about v4, they will reply back to you with:
"Thank you for writing to Bandai America. Since we do not ship overseas we ask that you contact the following Bandai office for product assistance."
The main office of Bandai Asia is Hong Kong.
You need credit card to order online. Most of products in Ebay ship within US only, meaning you need to be US resident to be able to get these. Outside US cannot, unless there are some sellers who might ship international.
Unfortunately, most tamagotchi sellers don't ship international
I'd encoruage you to wait for Thailand release than ordering one online. Why? The price sold online is usually higher than the ones sold in your country.
You have 3 more months to save up $$$, so be patient ok? Show your parents you are being a good girl by buying it with your own $ (means you save some of your given pocket money)