Fortunately, I know that Blue Rhino often has rebate/coupon offers and I was glad to find this one for $3 back. In general, we swap when our tank is looking like it needs maintenance and fill at a local grocery store for $20 when it's looking pretty new.
Hip2Save has found deal that can get you a final price after sale/rebates of under $10.
Happy grilling! Remember, it's hurricane season and it's always a good idea to have a full propane tank for cooking, sterilizing water, or what have you when disaster strikes. Just be sure to always use propane grills in a well ventilated area (outside), as even garages can be risky due to fumes.
Pinching Abe does, from time to time, include referral links and/or affiliate links within the body of the text. Please be aware that clicking on any of these and/or shopping through those links may benefit her by way of earning money toward a commission for referring you to specific deals or sites.