As swb
Or like you say wait for stuff to come up on eBay,
By the way ADT haven't fleeced you at all , you need to think about why I say that , I don't work for them or have any connection with them , your not saying much others don't say about other companies aswell.
You want to save money per month which is fine , but things cost money for companies they can't pay for everything
Anyhow back on track , eBay is your only way