How much are my Yugioh cards worth?

the god cards are worth around $70.00.shadow spell is only $3.00 because it came in a starter deck.mind on air is $10.00.gaia dragon champion is $12.00.xyz is $15.00.magic cylinder is $15.00.buster blader $15.00.gemini elf $12.00.blowback dragon $15.00.barrel dragon $8.00.slate warrior $12.00 riryoku$3.00