Like USAmermaid said, you can always make your own tail! I attached a Video that includes a Guide on how to make your very own swimmable Mermaid Tail! And if you decide not to, here's an ebay link that I've attached below which includes an "H2O: Just Add Water Mermaid Tail, Top, Locket and Plumeria Gift Package" that you may be able to purchase! Here it is:
link Just Copy & Paste the link above into the seach bar!
I Hope I Helped! And- Good Luck with your tail! I attached an H2O: Just Add Water Picture that you might like! Lastly, if you're interested in "H2O: Just Add Water" Then - visit my "H2O: Just Add Water tagahanga Club!" It includes Full Episodes (Even Series 3!), Behind The Scenes Videos, Forums, "How to: Look like your paborito character from H2O" artikulo (Cleo, Rikki, Emma, or Bella!), Tons of mga litrato (From Various Seasons!), and Much More! I hope that you check it out! Lastly (And Again- If you enjoy watching H2O: Just Add Water), then check out my websites! The first link is an H2O: Just Add Water Fansite!!! Here are the links! -
www.h2ojustaddwaterwebs.webs.com
&
www.cleosertoristyle.webs.com
Enjoy!
Again- Hope I Helped
-Cleo71
