Well I like to let it get down a bit (half or less) but where.. Well that all depends on several things
Many RV parks offer Propane fill, around me about 3.00/gallon
In Flint, MI Parker's propane 1.36/gallon
In Tekonsha, MI (Home of Tekonsha Engineering) Carmichaels, don't knwo the price though. Do know how to get there (Kind of out in the sticks).
MOST Flying-J truck stops as well as a lot of others
Many gas stations also have propane
Even ACE hardware in some states.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times