Don't count on always being able to return a product you've bought, whether it's from a store or the Internet. There is no law that says all sellers must take back an item.
"As Is" Purchases
A product that's sold "as is" doesn't have a warranty. You are buying what you see, whatever its condition.
Used goods are generally sold "as is." Check these goods carefully to make sure that they will work and don't reuire potentially costly repairs. "As is" statements may cancel any implied warranty given by provincial or territorial legislation. However, if the salesperson knew the product was defective when he or she sold it to you, you may have some rights under your jurisdiction's consumer protection legislation.