DC Released Flashpoint #1 FanExpo Variant

DC will be selling the following Flashpoint #1 variant at next week's FanExpo held in Canada.

"The exclusive Fan Expo Canada variant cover edition of FLASHPOINT #1 will be available at the Fan Expo Canada Exclusives Booth for $10.00. Fan Expo Canada will be taking place at the Metro Toronto Convention Centre from August 25th through 28th."

Question: Is it a norm that big publishers sell variants at conventions?