I bought a non Apple one on ebay for £2.50 inc p/p (at that price it's worth a dabble) and found it works fine on both my Samsung NX100 and my sons Panasonic Lumix with no problems.
Also check out "ipad camera connection kit" at Amazon for good reviews of one for £3.99 inc p/p
I also downloaded an app "Best Albums" that enables me to email pictures at a sensible size.