Here are a couple. i've had good experiences with all three vendors. I looked at HO T-5's, but the prices were out of my ballpark (little league).
I think most vendors are going with the NO T-5's instead of the fatter t-8's, etc. I just switched since they were more efficient.
Back to HO T-5's...
Try Big Al's Online too.
Let us know what you decide to go with...