How to properly respond to the comment "How much will you pay us?"

[MetalChaos0]

Hey, I was wondering if anyone could make me some custom pikmin sprites for a game I'm making. All I need are some sprites of treasures (I'll give you a list if you agree to make them) They just need to be single sprites obviously, but just so you know, I am using Mattdog1000000's pikmin sprites so try to make them go with that style sorta...(oh and I'm leaving for 2 weeks, so don't expect to get a reply or anything right away)