I had a can that just stopped spraying half way through. Did the warm water soak of the nozzle. Nothing worked, but can was half full. Sent an email to the customer service email on the can (in the fine print). Got a quick response from them that they had had some defective nozzles, and they sent me a new can in the mail. Was happy with that service. I love 505.
I shop around for prices, but find the larger cans priced well at Amazon, Overstock-com and Walmart-com.