I need a backup source of "top of book" quotes for INET, ARCA, BRUT, and NYSE/AMEX/Naz via an API for 500 stocks. Should be available 07:00-20:00 ET. Price should be under $300/month. (IB is not an option because it would require 2000 tickers, and I don't do $16K/month in commissions.) Anyone got this?