You can get all the Hammer products online at their web site, and it's usually cheaper than in the bike shops, even with the shipping, at
http://www.e-caps.com/. They give you a price break if you order several items at once.
I swear by the Endurolytes capsules; if I get cramps after a ride, 2 capsules eliminate them immediately. It's great to take them during a long ride. Hammergel is a great pick-me-up; I often take a swig just before a big climb.
I just tried Heed for the first time, and I think I'll take it on a century with me this weekend. I've started getting a little nauseated from GatorAde. At first I was put off because Heed, even the "mandarin orange," doesn't have much flavor at all; but I think for a long endurance ride that's probably a good thing.