Breaking stuff

I am directing The Goat, or, Who is Sylvia? by Edward Albee at Melville Theatre next year. It involves breaking, onstage, a lot of crockery/ornaments. Safety of the cast and audience needs to be paramount, of course. The cheap and easy option is to buy second hand stuff, and smash away merrily... This is not going to be the safest option. Looking online, breakaway bottles are about $20 a go, so I'd blow my budget on opening night. Does anyone have any thoughts as to how this might be achieved? I was thinking of unfired pottery. It could be painted to look finished, but won't break into dangerous pieces. Also, plaster Greek plates, as used in Greek restaurants. Any ideas?