Ever since the butter shortage, I've switched to cream cheese for my morning toast.
At the supermarket, 6 slices of cream cheese are about 298 yen (about US$2.98) or 49.6 yen per pat. The other week while shopping at the gourmet supermarket, they had a 10 pack for 375 yen (about US$3.75) or about 37.5 yen per pat...I picked up two boxes.
I've also found a good wheat bread made by Takaki bakery. It is there "ishigama" (stone oven) line. There are only 4 slices in a bag for 273 yen (about US$2.73) (in Japan, most breads do not have more than 6 slices).
With the shortage of butter, most bakeries have turned to using margarine or shortening, but they don't use margarine or shortening to make this bread, they use olive oil.