Another city of Austin service you might not be aware of (I wasn't). Austin and Travis Count residents may drop off home chemicals, such as paint, pool chemicals and motor oil – at the Household Hazardous Waste Facility. This service is free for up to 30 gallons, and is a great way to deal with those half empty paint cans that multiply in your shed mysteriously over time. Remember to bring a current utility bill.
The facility is open noon to 7pm Tuesdays and Wednesdays at 2514 Business Center Drive, which is at approximately Ben White Blvd and south I-35.