Two possibilities from Railriders -
Railriders Eco Mesh pants - quick drying, zip open mesh stripe, good for hot or cool hiking. Two drawbacks: Not cheap, and is impregnated with permethrin. These are my standard for Sierra hikes.
Railriders Ultralite VersaTac pants - Quick drying, no insect shield. Drawback: Not cheap.
You could also check places like Walmart, Costco, Kohls, etc, to look for really cheap nylon pants. Basically, any pants that are 100% nylon should dry pretty quickly. Not all will be comfortable in hot weather.