No idea for the exchanges
As for the lvl 2, Jerry said is an administrative issue. Dont know more.
But once lvl2 will be active, Nyse,Nasdaq,Amex with lvl 2 should cost about 48 usd only for 120 symbols (you can choice how many symbols you want). Just for comparison, IQfeed cost with lvl 2 about 140 usd (for 500 symbols yes, but who needs so many symbols in portfolio?)