Not for sure. But my local Canadian Tire store (a largish one) has some of them (an off-brand, price was closer to $14, I think). And I suspect many lighting-only shops would have them.

EDIT: Oh, and a Home Despot guy suggested to me that even Loblaws has had them in from time to time. The cheaper ones are rumoured to be "buzzy", but I have no experience with them. "Phillips" and "GE" are the "respected" makers, FWIW (or not).

cheers