I don't know why it doesn't show in the App Store on the iPad, but I can go to the store in iTunes, search for it and it appears. The cost is $0.99 (USD) and it's an iPhone app (which means, to use it on the iPad, you'll have to 2x the size up). I didn't buy it - but it should be a simple purchase, download and then sync process.
So, it appears you can get it via iTunes only. Good luck.
Marilyn