Apple has a proprietary wireless printing protocol called AirPrint. There are 3 options to get AirPrint at home.
Option 1 – Purchase a printer with AirPrint built in. >$120. This is the easiest option but does require the printer be configured. If you are buying a printer anyway, it makes sense to include this as a required feature was it doesn’t increase the price. Example http://www.amazon.com/gp/product/B008CJ1MTE
Option 2 Purchase a print server adapter to make your current printer. $90 http://www.amazon.com/Lantronix-xPrintServer-Home-Edition-Printing/dp/B008KCSPRK
Option 3 If you have a computer running all the time and is attached to the printer, $0 to $20 software will enable AirPrint. For Mac $20 http://www.ecamm.com/mac/printopia/