I was on ebay last night and there was a couple of southern pro dealers that sold them in 100 count packs. Do a search for crappie tubes and you can find them. They seemed reasonably priced and shipping wasn't to awful bad. Here is the link.
http://stores.ebay.com/Buds-Bait_Cra...MPLEPAGEQQtZkm
They got bout any color a feller would need or want.