If you have extra cash in savings......

(hey, you're probly not earning much interest on it at the bank...) take it down to the post office and purchase Postal Money Orders with it! That's cash for the P.O., and it stays with them until you cash the MO. (I have $3000 in postal MO's in my safe drawer, just sittin' there giving the USPS liquidity until tRump's gone and we can fix this shithole he's dug us into.)

(Got a suggestion to make this an OP)