No, I can not buy you a mermaid's tail.
Where you can find a mermaid tail but cheaper is, walmart.
it is imposible
It is different for every tail
Anywhere that has a costume
I think You can buy it on eBay
Mermagica is the best place to get a mermaid tail or, if you feel crafty, just go online and search 'how to make a mermaid tail' and make one yourself.
Well at Mermagica.com you can buy a tail for $100 +shipping or you could make a tail its way cheaper!
Second Life is an online virtual world. To become a mermaid, you only have to buy a mermaid avatar or a mermaid tail.