Where can I find an actual work sombrero?

My boyfriend works out in the sun a lot. I wanted to buy him a light straw hat that would protect him from the sun. Cowboy hats are not his style, so that's out. But then it hit me, what about a sombrero? It's literally a straw hat made for the climate.

But actually finding one is easier said than done. I don't want one of those silly costume sombreros, nor is a fancy formal sombrero appropriate. I just want, y'know, a sombrero–an affordable, broad-brimmed straw hat suitable for long hours in the sun.

But I can't seem to find them anywhere. Googling just gets me costumes and fancy, expensive hats. But I'm 100% certain that they're out there, and I just don't know where to look. It's a frigging sombrero for heaven's sake, it's too damn useful in Texan heat to not be sold. I've seen workers wearing them around town a few times.

So does anyone know where I can find a sombrero in Houston?