http://www.ipadaccessories.com/general/finding-used-iPads-discount-iPads-and-iPads-on-sale/ or check ebay.com that is the main source. or http://usedipadoutlet.com/top-iPad-accessories.html
There are so many used ipads online. I have always had a lot of luck with the following online sites; craiglist.com or ebay.com. You also might want to try some garage sales.
Yes, Wal-Mart has some good deals on laptops. However other stores which specialize in electronics such as Best Buy may have better deals. Many good laptop deals are also available online at Amazon.com, Dell.com, Overstock.com and others.
You can find a used iPad in your area on Craiglist. Amazon and ebay are also good websites to buy used iPads at a more affordable price. Just type in "used iPad" and they will be listed for you. Make sure you look at the seller's reviews to make sure you are not sccammed.
Craigslist is a good place to find used wreckers
A good place to find a good used Jeep CJ would be online at used car sites. Also, someone looking for a used Jeep CJ could try the Auto magazine such as Auto trader.
Craigslist is a good place to look for used ipods. Just make sure that you find a good descriptions of the product and have found a good reliable seller
AutoTrader has a pretty good reputation, so it should be a fine place to search for used trucks.
You can buy iPads from Apple stores or from their website. Other retailers also sell the iPad such as Best Buy and Walmart. You can also buy used iPads from eBay and amazon.
A good place to start your search would be www.truckertotrucker.com.
www.mobilityvansales.com is a good place to look
iPads cannot be used with an Anti Virus software. In fact, they are virus free. Do keep in mind iPads can be hacked but not via the internet.