Des Dp Even you hire an agent for your extension, you need Thai bank account. And without your funds in Thai bank account, you also need Thai bank account. So regardless of using agent, you need Thai bank account. If you have no non o visa, you can not open a thai bank account alone. That is the difficulty for foreigners in normal case. That is why there is a service package all in one, visa , bank account, one year extension . So price varies but I think around
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THB or something? but I heard, in Pattaya, cheaper than this.