There are many opinion`s out there, claiming, Thailand is so cheap... Well, I can not agree, but also not disagree. All depends on yourself, what to expect and quality of life, you wish to have over here.
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Let start with basics. If you have book your accommodation with breakfast, fine. But, often, they don`t have milk, but powder replacement. Milk in Thailand is usually the same or more, as in UK. Coffee, somewhere will cost you easy £2 pounds. Beer, in Bangkok and other tourist spots is most expensive. Pub quality location, usually £1.40 for a small beer (about 1/2 pint). Outside Bangkok and inside Thailand, you`ll get roughly a pint (bottle) for £1.40. If you intend to enjoy your beer at one of the "Red Light" girl spots in Pataya, Bangkok and so on, a small bottle of beer will cost you double. Prices, you`ll find otherwise in Dublin... Even Amsterdam is cheaper. But, if you are happy with traditional Thai street food, a medium Pepsi or Coke, you might pay just £1.20 - £2 pounds all-together. (See also below Bangkok map and more info`s)