Here's my trick.
Go to your local land fill/dump.
If they are like most they recycle propane tanks.
I have found one 5lb tank and a 11lb tank (free) I took the tanks to my local propane dealer and had them reconditioned.
The cost to me with the tank filled was about $30/$35 bucks.
It pays to recycle. Or should I say it saves to recycle.
Wayne