Where I used to work we began using "centrifuge" containiers.  They came in a
styrofoam packet of maybe 12 or so and each one held like 45 or 60 cc.  Maybe
lab or  materials dept have suggestions.  Even sterile specimen cups maybe
could be used? I could find out more if you need me to.
Laurie Wheeler, rnc, mn, ibclc
Louisiana
P.S. I got the ILCA roster - I really like the new format