It's possible at some point you may need or want to buy another charger for your iPad or iPhone. As you do a bit of shopping you'll find quite a disparity between prices. The genuine Apple chargers are more expensive, but definitely worth the extra cost, in my opinion.
Why is this, you might ask? Read this aricle to find out why. Remember the old adage "You get what you pay for?" In this case this is really true. The article states: "Apple's charger is expensive compared to other chargers, but is a high quality product. You should definitely stay away from the cheap counterfeit chargers, as they are low quality and dangerous."
Don't buy the cheap, counterfeit chargers -- why take a chance on a fire or something worse?