As you may notice Fuji did not discontinue 220 E6 film yet, at least for the Japanese market.
I do see a bunch here in Tokyo Japan.
Example for ASTIA 100F 220:
However, it may be true that in other place in the world, they stopped exporting.
May be you could buy it from the shop like below (direct import from Japan):
... but looking at the price, I think it is too expensive (too much commission?, approx. $20 higher compared to the price that I can get in Tokyo for 5 rolls pack).