IMO if you are growing bagseed, you should do it to learn the basic principals of growing. Sure you might get a female here and there but in the end, you'll probably be happier if you order from a seed bank. Grow some bagseed to get comfortable with the process. You can get used to a watering schedule and/or nute use. I'm growing bagseed myself, but I'm doing it just to do because I have Northern Lights going right now too.
I have heard many good things about Attitude. I personally used buydutchseeds.com. Prices seem reasonable and shipping was low key. So far 2 out of 3 germed and I still have 7 seeds left.