Cost of Invisalign just for top teeth?

I'm getting crown on my two front teeth in about a year but I first wanted to straighten my top teeth. They are just the slightest off from when my wisdom teeth came in the two teeth on either side of the front teeth crowded just by centimeter. So I'm sure it wouldn't take to long to get them fixed. So I was trying to get a ruff estimate for getting those two teeth to shift back just the slightest. I have had my wisdom teeth removed so it won't happen again. They were perfectly straight before