I've recently spent hours researching this since my local source for Callebaut closed last year. (I think the very low prices they were charging may have had something to do with their closing.) I was not looking for large quantities so there may be cheaper sites if you are buying more. I ended up purchasing from Gygi: Belgian Bittersweet callets, 5.5lbs for 25.99, Belgian Milk chocolate callets, 2.5 lbs for 13.99, Belgian white callets, 5.5 lbs for 31.99. They also stock Guittard not E. Guittard) which was cheaper but I prefer Callebaut. They also had "non-Belgian" Callebaut, produced, I believe, in Canada, also cheaper. The people at Gygi's that I spoke to on the phone were extremely helpful. My order should come this week so I'll see if they are also efficient.