looking for ribbed tubing

No problem.

I was on a hunt a while back myself and there are many sources.
You can also look up corrugated pond tubing that stuff is great.
 
Do you need it to be flexible? And what thickness do you need? If you are looking for something more lightweight or thinner in diameter, you may want to check out electrical Flex Tubing (like this: http://www.homedepot.com/p/Gardner-Bender-1-in-x-5-ft-Split-Flex-Tubing-FLX-1007GRT/202905450). It's flexible and pretty cheap.

Also, if you want something flexible but in a thicker diameter, you may want to look into sump pump hose kits like this: http://www.homedepot.com/p/Nelson-Plastics-1-1-4-in-x-24-ft-Sump-Pump-Hose-Kit-00108/206320646 You get a lot of length for a fairly inexpensive price.
 
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