Doc, Just buy as many as you need and i can pick it up for you and catch up with you in the city one day to give it to you. You work near Surry Hills don't you?
I don't know if the ebay link shows it or not, but while the description is correct that they contained vinegar, what was not mentioned is the label on the cubes say balsamic vinegar.
I don't know if that makes them less suitable.
I picked up 3 last week. 2 were clean, but one had black staining on the inside that took 3 washes of PBW to get the majority of the black stuff off.
Still, the offer still stands, more than happy to pick, and bring em to work for you. Let me know.
Cheers
Josh