H-1B Visa stamping in general and in third countries like Canada

My H1B petition got approved through my existing employer and became effective 10/01/14 (I was on F1 OPT before). Where am I eligible to go to for doing first time H1B stamping, other than my home country (Russia) – can it be done in Canada, Mexico, or other countries? I have Masters from an American university, and over a year of working experience in the US. Also I’ve heard that starting June Canada has suspended doing first time H1B stamping, can you please provide any clarification, and also could you please advise what all options are available to me?