I can't find this to purchase.
Part # C2228-3

http://www.homedepot.com/s/flapper%2520alternative%2520flush%2520handle?NCNI-5

You must get the toilet repair kit sold at Loews, and Home Depot, and many other discount, and hardware stores. I haven't seen the handles sold separately anywhere, but the kits come in many brand names.

http://www.homedepot.com/catalog/productImages/145/3b/3bff7efd-466e-4e38-bbcc-eca7c5303a42_145.jpg

http://www.homedepot.com/catalog/productImages/145/7b/7b6d3934-2b1d-4c8e-bfd0-a3179f43a81f_145.jpg