Unless you want my source (a brazilian bb store) then you have to opt for my online option
supplementdirect.com
IT IS EXTRMELY CHEAP THERE. $11 = 10lbs.
As opposed to $2.69 a pound from protein factory. If you want to go to the grocery store, pick up some sweet tarts- they use dextrose as their tangy main sweetener. Be sure to get exact nutritional info though and make sure they didnot change formulas - you always risk crap like this. This option use it as a last resort . sweet tarts have other crap in them you dont want in excess (yellow 5, conservatives preservatives laxatives explosives all that nasty shit you find in us junk). I know, i exagerate a little....
Did I help?