Cheap gel flasks?

Where, oh where, can I find gel flasks cheap enough to throw away on the course instead of having to bring them home and clean them out? It seems that they should be cheaper than water bottles, but they're not. Maybe it's a supply-and-demand thing. The best prices that I could find are:



Tri-sports.com sells these 4-ounce flasks for $2.25 each in quantities of 5.







National Running Center sells these 6-ounce flasks for $3.99 each.

The best price that I could find on eBay was $1.80 per flask (shipping included) for four 4-ounce flasks. That's getting closer, but....

Those prices just seem too high to me. I'd like to find about six 6-ounce flasks for under $1.50 each. Maybe I should do like Ellie and just use cleaned-out mustard bottles. But I don't even eat that much mustard! Or maybe an old Elmer's Glue bottle?

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Update: Thanks to Rob Buethling for pointing these out to me, at the Container Store. They might work, probably leak less, and are only $0.99 each for the 4-ounce version! Plus they would probably fit in my bento box on my bike better! Great find! Except I can't walk into that store without dropping $100 or more, so it might not be a money-saver in the long run!!!

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Update 2: Yay! Dale from TRI-DRS found 5-ounce gel flasks on sale for a buck apiece at the Hammer Nutrition site! SOLD! Why not splurge and get a dozen!?