How much you pay for log cabins depends not just on the size of the building but also what types of logs have been used to build it. There are some, which have been built using handcrafted logs, which are quite expensive, and there are those that have been built from milled logs and these types of cabins are a lot less expensive.
It is important therefore before you actually decide on getting such a cabin built you know the difference between milled and handcrafted logs. Generally, those that are milled have been prepared using either a sawmill, a lathe or a planer. This then ensures that each log will be cut to a specific profile or shape. As you will soon discover milled logs have a far more uniformed shape and size to them compared to handcrafted ones.
In addition, what you will often find that milled log cabins are ones where the wood has been either air or kiln dried. This enables the right amount of moisture to be extracted from the wood before they are used to build a home with.