I've seen lots of sites selling little bottles to put lotion in, but I've never seen any that sell squeeze tubes for lotion. I looked around at like 50 sites, and still couldn't find any.
I wound up talking to a manufacturer, who made me buy 10,000 of them. I don't need that many so I'm selling them on eBay to anyone who wants them.
check out http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170302819698 seller "tube_supplier"
Here is a link that might be useful: Supply of lotion tubes on eBay