You can go to the Burro Canyon shooting range at the end of Azusa Canyon. They don't allow you to setup garbage and whatnot on the range, but paper, steel, and generally anything you can shoot and not blow to little bits is okay. Take the 210 to Azusa Rd and head north into the mountains. From there, just follow the signs. The cost is $10 with a target stand.
The Lytle Creek range is open again. It's off the 15 freeway, about 2 exits south of the 15/215 merge. Same story as Burro Canyon, targetwise and pricewise. Again head north into the hills after exiting on Sierra.