i used to have about 150 bottles before i started kegging (actually i probably still have about 150 bottles now, i just dont use them though)
crates for beverage bottles can be found behind supermarkets and cafes, but they have to be 'found' at quiet times of the day.
You have to be careful when 'finding' these crates as the companies who rip off our nations' dairy farmers don't like us 'finding' their crates...
i don't get an attack of the guilts as i just think about how 'much' the bloke who milks the cow actually gets from aforementioned (most likely foreign owned) company.