Amazon has the 20-Lb Flame King Empty Propane Cylinder w/ Type 1 Overfill Protection Device Valve & Built-In Gauge for $25.99. Shipping is free.
Walmart also has the 20-Lb Flame King Empty Propane Cylinder w/ Type 1 Overfill Protection Device Valve & Built-In Gauge for $25.99 with free store pickup.