Does Invisalign Cost The Same Whether You Straighten Top Or Bottom Teeth Or Both?

I only need to straighten my bottom teeth, and my dentist recommended Invisalign. I was given a rough quote of $5000, but I don’t think this was customized to my case. Does anyone know if Invisalign costs less if you only fix the top or bottom teeth, or is it $5000 always? Also, my insurance says it covers 50% of orthodontics but doesn’t mention Invisalign. Anyone have experience with this? Thanks!