I'm a bit dumbfounded by the Fry's thing but besides GW (a couple brands), Urban Fare carries a natural cocoa as does WholeFoods and I'm quite sure Famous Foods does as well. I used the brand from UF that begins with Dagouin? (sp?) specifically for that cake and wouldn't go there again. I've made that cake and in spite of the chemical leavening, you're correct, it doesn't suffer using DP. On the other hand, I've used Scharffen Berger natural testing recipes where that wouldn't be compromised by the lack of acidity but I'm too used to the clarity of flavour in the DP.