Related & helpful Links
MacUpdate -The place to find software updates for any Mac app or utility.
Powermax is a good and reputable place to buy used Macs and iPads at a decent price.
Gazelle is a good place to sell your used iPhone or buy a used one.
Other services that might be better than Gazelle:
New to Apple products? Their sitemap can help you get started here.
Support - To check if your device is covered under AppleCare, check here.
Apple Certified Refurbished Hardware - Same warrantee as brand new, more thoroughly tested than off-the-shelf products, can be found here.
Looking for an Apple software update? You'll find that here.
For a comprehensive list of Apple links, look here.