I got my solid flashes from SportKilt. Part of the reason is that they're inexpensive. Another is that many inexpensive flashes I've found are simply a piece of ribbon while the one's at SportKilt.com are felt and look more like wool. Also, some other cheap flashes I've seen have some hard sheet sewn inside and they wind up getting bent outward and staying that way.

Finally, the one's at SportKilt are the only inexpensive ones I've seen that use a clasp closure instead of Velcro. I have velcro on flashes. It always get's snagged on my hose. The clasps are the way to go.