Where can I go to make an informed purchase of used cell phones in St Catharines?

My wife and I purchased a used phone a week ago for our niece . She has been begging us for a new Samsung Galaxy Note and we thought it would make the perfect Christmas gift . We decided to go into MTX on Merritt in St. Catharines to look for one . MTX had a few different Samsung phones for sale and only had one Samsung Galaxy Note 2 available. We were sold! Samsung Galaxy Note and received a 90 day warranty. The staff also helped us in choosing a cover and screen protctor. We were very happy with the quality of service we received and we can't wait to see her face when she receives her gift Thank you MTX