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

My wife and I grabbed a used phone a month ago for our granddaughter. She has been begging us for a new Samsung Galaxy Note and we thought it would make a great Birthday gift. We decided to go into MTX on Merritt in St. Catharines to inquire about one. MTX had a few different Samsung phones for sale and only had one Note 3 available. We were sold! Samsung and received a 90 day warranty. The staff also assisted us in choosing a cover and screen protctor. We were very happy with the quality of service we received and we are extremely excited to see her face when she receives her present. Thank you MTX staff