Anywhere you see the Shopping Cart Icon you can click to purchase. When you are finished shopping you can Checkout with Paypal. No login required.
Look for the Offer Icon for items where you can make offers to purchase that item at a lower price. Your offer may be accepted, countered, or declined.
Look for the Search Icon after you search or browse a category. Save your search to access later.
View your Saved Searches. Can be set to email results on a weekly basis.