I've tried both types in both brands you mentioned and I think the raw type of Wholesome Sweeteners tastes a bit "nuttier" than the light version, for lack of a better description. I use it all the time for sweetening drinks and it doesn't taste odd at all, it's great actually.
In terms of where to buy it for cheap, I get mine off iHerb
. They sell 44oz bottles of both the raw
varieties for around $10 each. If you're in the U.S. you get free shipping on orders over $20, so if you get two bottles at once there would be no shipping charge.