I've never heard of stores not being allowed to sell ammonia anymore...the last time I really checked was 2 summers ago when I cycled my 55 gallon, but I'm sure people would stop recommending this cycling method if that was true.
I guess if you cannot find the ammonia the other methods mentioned do work, however they may take a little more time and effort.
I guess if you cannot find the ammonia the other methods mentioned do work, however they may take a little more time and effort.