In San Diego County, there’s still time to buy water-conserving rain barrels without getting soaked. A $75 rebate on rain barrels, offered by the San Diego County Water Authority and Solana Center for Environmental Innovation, drops to $35 on Jan.1. The barrels are made of heavy duty recycled plastic, hold 50 gallons, have a lid with a screen at the top, and a spigot at the bottom. They sell for $90 each before the rebate, discounted from $149.