Where can I go to buy used cell phones in St Catharines?

My wife and I picked up a used mobile phone a week ago for our niece . She has been asking us for a new Samsung Galaxy Note and we thought it would make the perfect Birthday gift. We went into Mobile Tech Xpress on Merritt in St. Catharines to look for one . Mobile Tech Xpress had a variety of Samsung phones for sale and only had one Samsung Galaxy Note available. We purchased the cellphone and received a 90 day warranty. The staff also assisted us in choosing a otter box 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 opens her present. Thank you MTX