Typically these do-it-yourself packages are manufactured and sold in several different combinations. To accurately compare between various producers, you must make sure you are comparing similar packages. Try buying some industry specific books and magazines which will provide you with plenty of industry sources of log cabin kits.
If you've made your purchase with the intention of putting it up yourself then you'll find the biggest benefit of building your log cabin from a kit is that the manufacturers provide precise, computer-designed plans, volume-discount materials sourcing, cutting and pre-fabricating. Depending how long you work each day, most cabins can be built in about 1-2 weeks with a small crew of 5-6 people.
Finished Log Cabin Kit for Sale - Prefabricated Cabins