Here's the main web stie for the national Better Business Bureau (BBB) organization:

lookup.bbb.org/

On this page, enter the city and state, click the link on the resulting page, and then click the specific link for that city or region and then look for "consumer" section to find reports on businesses.

I also looked up these Yurt companies in their respective local BBBs:

Colorado Yurt Company, Montrose CO - had nothing listed at all
www.coloradoyurt.com/yurts.htm

Rainier Yurt Company, Seattle WA - had nothing listed at all
www.rainieryurts.com/

Yurt Living, Dahlonega GA - had nothing listed at all
www.yurtliving.com/yurtsource.htm

Great American Yurts, Indianapolis IN - unsatisfactory rating
www.yurts-r-us.com/
11 complains in last 36 months, 6 in last 12 monts
mainly slow delivery time, poor product quality, and lack of response

Pacific Yurts, Cottage Grove OR
www.yurts.com/
did have a BBB listing - no complaints in last 36 months
so that's a good sign

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here's a list of other Yurt-related companies if you want to look them up too...

Yurt Info
www.yurtinfo.org/buy.php