Formula after 1yr old

Erica • 1st time mommy of a beautiful little boy <3

So my son turned 1 on the 16th of may and we had already started weaning him off formula at about 10 1/2 months. I have him almost fully off a formula and on whole milk except for at night time. Still wants night time formula bottles. Between 8 to 10 sometimes 12 oz of formula. How in the world do I get him off formula for good before I run out Total. This is still wic formula I got for the month. I'm not buying anymore.

Edit: we tried cold turkey. It was a bad idea. I was also told by his doc not to do cold turkey because it could really mess with his stomach considering he did not have any dairy for the first 6 months of his life.