I found different dealers , Let me search out some Used Toyota Sienna Prices from AutoTrader.ca (due to the data today)
Toyota Sienna 2006:
1: 2006 TOYOTA SIENNA LE AWD , Mileage: 84,466 kms, $17,997 (WRIGHT AUTO (Imports), )
Phone: 866-980-3839 Address: 170 Weber Street South, WATERLOO,ON N2J 2B2
2: 2006 TOYOTA SIENNA CE **0% FINANCE** in MARKHAM, ON $19,900, Drive: FWD Mileage: 79,866 kms
Markville Toyota, Phone: 1-866-980-6805
3: 2006 TOYOTA SIENNA LE in HAMILTON, ON $12,995, Mileage: 83,500 kms (Private)
4: 2006 TOYOTA SIENNA LOADED!!! NEW ARRIVAL!!! ONE OWNER!!! in TORONTO, ON $13,995, Mileage: 95,000 kms
Phone: 1-888-521-4718
5: 
2006 TOYOTA SIENNA CE Minivan 4D in RICHMOND HILL, ON $16,888, Mileage: 73,663 kms
Call 888-545-7320
6: 
2009 Toyota Sienna CE Kilometres 25,000 Sale Price $24,900
Toyota On the park , 1 (888) 295-7923
7: 
2006 TOYOTA SIENNA CE Minivan 4D in PICKERING, ON $17,995 Mileage: 91,837 kms
8: 2006 TOYOTA SIENNA CE Minivan 4D in Vaughan, ON $17,995, Mileage: 87,880 kms
WE CERTIFY, EMISSIONS TEST AND DETAIL.
WOODBRIDGE TOYOTA
9: ????????
(all Stupid prices from this dealer, funny !!! )
2006 TOYOTA SIENNA LE Minivan 4D in MARKHAM, ON $22,995 ????, Mileage: 98,607 kms
DON VALLEY NORTH TOYOTA