Domain names selling

Hello
I have different domain names that I might want to sell. Do you know if they are worth it and what price can I hope for these… and where I can sale them ?

My domains :
freelancerlife.com – (working-living as freelance)
stockphotolife.com – (working-living with stock photography)
slopestyle.us – (new olympic skiing and snowboarding discipline)
snowboardinglink.com – (snowboard related stuff… I recently stop doing that website, didn’t had time for it)