At work we are using Cintas as our shredding service. They give you a 90 gal locked trash can, shred on site and return the can to you for about $20 per pick up. We have two for our office and they pick up monthly. They also have smaller, locked containers. If you have killed shredders in the past, this is probably a better option. We have scheduled pick ups, but they may also do "on call" for you if your demand is less.