So Friday I went out to buy a new set of lights for the third shelf since my eggplant had popped up and I didn't want it to get too "leggy". Went to my usual store and they only had one light (I needed two). They said they might have more in later in the day, but didn't know. Didn't even offer to put one aside or order one. I bought what they had and then ran around town trying to find another. No such luck.
So I went to Home Depot to see what they had. Couldn't find any 4' T5 lights that plug in, but did find some T8 ones. They were just under $18. Then a set of two daylight bulbs for the fixture was like $9. So for less than $27 I got a light that actually works better than the T5 ones I bought previously. They're brighter and are longer (even though all of them are supposed to be 4'). So I think I am going to see about taking these other ones back and replacing them. I haven't been entirely happy with them, but they were what I could find. For the $40+ I spent on each one, I would expect more.
If you go to Home Depot looking for them, here is what I got: