You always need a coffee fund.
I made a coffee fund box awhile back to fund an espresso maker for the studio. I was given one as a gift so now I use the fund to buy coffee for it. Each time I make a cup I put in a dollar. Nothing compared to buying an espresso drink on the way to the office.
I got some graphic tins to put biscotti in and I’m set. A happy little corner of the studio.