The real estate board in the Okanagan (OMREB) surveys buyers agents to find out where the buyers came from and what they purchased.  Here is October 2011’s summary results.

Property Type:
21.9% of purchases were by Move-Up Buyers
19.5% by First Time Buyers
13.0% moving from Single Family Home to Strata Unit
12.4% buying Revenue/Investment Property
7.7% moving into Retirement Home/Seniors Community
6.5% Recreation Property Buyers
1.8% moving from Strata property to Single Family Home

Moving From:
46.0% from Within OMREB Board Area
15.3% from Other Areas in BC
14.2% from Alberta
13.6% from Lower Mainland/Vancouver Island
4.5% from Saskatchewan/Manitoba
3.4% from Eastern Canada/Maritimes
2.8% from Outside Canada
0.0% from NWT/Yukon (second month reported)

More details: http://www.omreb.com/matrix/documents/October%202011%20Buyers%20Survey%20Results.pdf