It is 40 rupies for each normal mask

The Keaton Mask: This one has that sort of Pikachu look. Your team leader will ask you a question. Get it right you get a heart peice. Get it wrong get nothing.

The All-Night Mask: After you get this mask go to your team leader. He will ask you a question about any zelda game. If you answer right you get a heart peice. He will ask you another question. Answer this one right and get another heart peice. Whatever ones you do not get right you have to try again the next day, The Postman's Hat: Get a heart peice from the mailbox in clock town. Then check it repeatedly to get a single rupie each time. There is a limit of 200 rupies.

Great Fairy's Mask: This will attract fairies from the temples in Termina. They will restore your health.

The Blast Mask: This mask can help you win a fight with sort of a strange little twist to it. It will kill you along with it but will destroy the other person. If you or them have a power level that is above 8,000 it will not kill you just really mess you up.

The Stone Mask: This masklets you become invisible to enemies. Once you hit them or if they use the lense of truth they will know you are there. You cannot have thise one on for too long during a fight because you are not able to see what you are doing behind this stone mask.

The Mask of Scents: This one lets you see your smells. You can find the ingredients for blue potioin with this and you can also find gold dust and magic dust.

The Mask of Truth: This mask lets you takl with gossip stones. You can also hear what animals say.

Romani's Mask: Proof of membership at the latte milk bar.

The Bunny Hood: You can run very fast with this mask on. You can alsoo jump high and when you are a small child in hyrule this mask lets you go through hyrule field without being bothered by the skeletons.

Kafei's Mask: No real special powers are with this mask.

Circus Leader's Mask: No special powers come with this mask.

Don Gero's Mask: Gather up all the frogs and let them perform a song for you, then get a heart peice.

Kamaro's Mask: Use this to dance in front of the two sisters in clock town at night to earn a heart peice

Couple's Mask: Show this to the mayor and all the people debating in his office to end the fight and get a heart peice.

The Garo's Mask: When wearing this masks, in certain parts of termina Garo`s will pop up and challange you.

The Gibdo Mask: Talk to mummies with this mask.

The Giant's Mask: Wear this in Twinmolds boss room and grow gigantic. While you are this huge you may not use magic or any items but your sword