Throughout my first 6 months commuting, I used the dollar store and self built stuff.
When I knew I was going to continue commuting, I started investing in better gear for visibility and ease of use.

Lights that I have semi-permanently to my bikes are PBSF and a couple very bright SF-like Viewpoint flashes I got from Performance on sale for $15.
I move my Magic Shine from bike to bike as needed, but usually have a backup flashlight and batteries in the front bag or pannier of each bike I have.
I DO tend to commute after dark about half of the time, so for me, I like to be seen and see enough of the road that I can ride at a reasonable speed.
I also ride with an oh-my-god-it-hurts-my-eyes florescent reflective construction vest at night...sometimes with a headlamp on my helmet.
If drivers don't see me, they don't have their eyes anywhere near the road.