expired Chemist Warehouse Boxing Day 50% Vitamins (until 6th January 2013)
This was posted 4 months 25 days ago, and might be an out-dated deal
I have been waiting for this deal to come around again. I mainly buy Blackmores vitamins and the 180 capsules sustained release multivitamins which are $31.23 again (I think the last time it was at this price was mid year some time).
ps: not all vitamins are sold at "50%" off as per comments below.