"Here", we don't pay for used oil disposal. Have a company that supplied us with 55 gal drums with lids to throw the filters in. We have an older 200 gal tank in the back of the shop that the used oil goes in. When we are full (or when they are in the area), they stop by and swap drums for an empty, pump out the tank, etc. Rules for burning used oil are getting tighter here. Also many shops don't want to be bothered with it because the maintenance cost on the furnace is higher. (Maybe they need to filter better???)
Andrew