You can buy an iPad online at Apple.com or in any of Apple's retail stores. In addition to the official Apple website and store, you can also buy the iPad on Amazon and eBay and in Target and Best Buy stores.
Here are the prices:
Wifi:
16 GB: $499.99
32 GB: $599.99
64 GB: $699.99
3G (with monthly contract):
16GB: $629.99
32 GB: $729.99
64 GB: $829.99
Amazon sells a good bit of iPad accessories, that is one place to check. Another useful site would be eBay. You can get them used or new from both sites.
celebrate
There is no iPad 4 yet. The current version is generation 3, or New iPad.
probably at walmart if you want it new or eBay if you don't care if its used or not
If you are looking for an iPad the best place to look is on the Apple website at Apple.com/iPad. The price range is between $400 to $600 and depends on how new and powerful the model is.
new york
the best place to by new shrubs is at the home and garden center in your local walmart i buy mine there all of the time and they are the best shrubs i have ever owned
The best place to find a new iPad for the cheapest price is probably Ebay.com. Although the most reliable source to purchase would be the official Apple store or the online Apple store if one is in your area.
You sell it and buy an iPad3. All of your apps can the re-installed on the new iPad.
Of these three, the best is the New Ipad (a/k/a Ipad 3).
There is no such thing as an IPad 16, however, there is a 16 gig IPad 2. You should buy it, if you need a bigger IPod Touch, for things like editing or browsing.
Sadly, no. BUT they are the same price, so.... Sell the old one and buy the new one with the money you sold it for!