the prices for items ordered from Lazada are include all taxes and shipping costs, regardless from where they are shipped. However, I don't know how they handle the custom clearance. It's not about deliveries from Lazada. Maarten mentioned there is a 0% VAT agreement between China and Thailand which is not correct. Any import is subject to VAT, regardless of origin and its just a question on how companies like Lazada handle the import process.
you need to pay VAT on everything you import. What you might referring to is the Form E (ASEAN China FTA) which regulates the import duties on certain goods.
Someone who looses his job or gets divorced gets 7 days and that's it. Most of those people have a life here. Someone who 'is unable to travel' can get extension after extension. Not fair.
you can't work on a marriage visa without a work permit, even if you don't get paid. Besides that, he said girlfriend so not even a non O based on marriage unless they have kids together.
oh sorry I misunderstand. If you are single and don't have a Thai wife or Thai child to take care of, I am afraid the Non OA might be the only way for you. But I might be wrong. You can ask an expert about it.