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Amazon [amazon.com] has Flame King 5-FT Steel Braided Hose, 1 lb to 20 lb Propane Tank Adapter for $12.99.
Shipping is free with Prime or on $35+ orders.

Home Depot [homedepot.com] has 5′ Flame King Steel-Braided Propane Adapter Hose w/ QCC1/Type1 to CGA600 (SS-QCC-1LB) on sale for $12.99. Shipping is free or choose store pickup where stock permits.