markets typically do not show up until very late (3 AM NY). When markets are made, they are usually wide. I haven't looked in a while but since many of these stocks trade in Europe (you can access them via multi-currency account), I would guess the spreads tighten when Europe opens. The best thing to do would be to load up the symbols you want next to the corresponding european market and trade the tighter spread).
If I get a chance later today, i'll take a look.