Actually I just saw it today in the supermarket. As coconut oil is becoming so popular it is often found next to the oil on the store shelf. Many organic food stores carry it. I would also try Trader Joe's and Whole Food Stores. If you live livTrader Joe's as well as Whole Foods.
If these semi specialty stores aren't available to you, just use granulated sugar. Coconut sugar has no coconut taste. It's a nice sugar, but regular is fine. It is much easier to find now.
It seems to be available in many groceries these days, Wegmans, WHole Foods, Trader Joes.. or even Home Goods. Replacements: Powdered Jaggery from any Indian grocery.
You can buy coconut sugar from Amazon.com.
Sometimes it is labeled "palm sugar".
I always find mine at Asian markets, but have also recently been seeing it at Whole Foods and Walmart occasionally (go figure!)