LV prices in Thailand range from being 5-15% more expensive than US/UK from my experience. The higher the price of the goods the more likely it is to be more expensive. I find that many small leather goods (excluding certain style/line, i.e. koala, suhali line, accordeon, vernis, utah, MC etc.) are priced similarly to the US/UK.
Being a Thai person I do not qualify for the 7% VAT refund and being a student in the UK I do not qualify for the 17.5% VAT refund. Therefore I just buy what I need wherever I am (UK or Thailand) as the price difference will be relatively minimal.