Amazon.com, even without Prime, is awesome. Their prices change, sometimes daily for items, many times reflected what other places charge. I've had Amazon.com price match another on-line store before though that's not policy for them--but if the price goes down on Amazon.com, call customer service and they'll match it (if it was a recently placed order).
Amazon.com offers coupons for many items that are very good. For example, in a grocery box of items I'm having shipped to a US address, the first item of many of the items I'm buying come with a coupon for $1, $2, 35% or other amounts off.
The convenience of free returns on many apparel and the convenience of not shopping in stores, but having everything sent to an address that I can pick it up and take it back over the border makes it worth it. With Prime, there is NO minimum, so for example, you can purchase one item for $1 and have it shipped free.
Please be sure to read the entire series of Why CDNs Should Get Amazon.com Prime NOW to not miss out on any of the info you'll need to get the most out of your subscription to Prime! Please sign up HERE to get Amazon.com Prime membership for free for 30 days.