basically what lando said. 15 might be too much, but definitely know what you're doing before you go cutting tubes. i'd hate to have to order more tubing simply because i had no idea what i was doing when i started cutting...lol I think that 13 feet should be plenty.
$1.25/foot is about normal though. Clearflex is ok, but I suggest Primo-Flex, available at Voyeurmods.com. It is more expensive, but it totally rocks. It has the tightest bending radius that I have ever seen. Super flexible, sturdy, you can't go wrong. However, if you need to save some money, HomeDepot has some cheap tubing in stock that goes for $5 for a 10' roll.
For the HomeDepot stuff? Yeah, it's not bad. It doesnt bend the tightest turns, but for $5 a roll you can't beat it. If you can set up your system with minimal bends, then go for it. If not, spend the xtra money and get the good stuff.
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