I got some from Tesco, I noticed that there were several brands on sale. Canderal have their own version. The jar looks huge against the Truvia jar for £3.29 whereas the Truvia is in a much smaller jar for £4.99.
However, you need to look close at the labels. Canderal version states 2 cals per teaspoon, and is bulked up so equates teaspoon per teaspoon of sugar. The jar contains 75g, and the bulking agent accounts for the 2 calories.
The much smaller Truvia jar is 185g, and is 1third teaspoon per teaspoon of sugar, so does not have the bulking agent that the canderal version has. In fact, Canderal can only be 1 third stevia and 2 thirds bulking agent, so in fact only contains 25g stevia for £3.29 compared to the Truvia 185g stevia for £4.99 which is much better value and zero calories.
So, taste. Im very averse to sweeteners, really dont like the aftertaste at all and would rather do without. To me, Truvia has an aftertaste, slightly bitter like most other sweeteners. Im very dissapointed, as I had great hopes for it. But it is a lot better than most other sweeteners out there. I wont be putting it in my coffee, and ive done without sweetener or sugar in my coffee for so long that I dont really care anymore. But I can see myself using it in salad dressings instead of honey, or in cooking.