I usually wait for bulb sales at drsfostersmith.com. They don't charge extra for shipping them.
Hellolights.com is another place that I have ordered from. Website is a bit weird, but they used to have great prices for NO T5's.
Reefgeek and DIYReef are others. I think Bigalsonline.com has bulbs too.
There are other non-aquarium sites that have them for cheaper, but they mostly sell yellowish warm-white and cool-white bulbs.
As for better bulbs, this comes down to personal preference. Try some out and decide for yourself regarding bulbs made in Germany, Hungary, China or Timbuktu. There are many GE bulbs in this world. If you are referring to Starcoat T5HO 6500K bulbs, they are a good value, live a long life, supposedly good PAR, and the hue is a bit too yellow for me.