I'm just in the process of setting up a woodie colony and I've been advised to get 1000 adults, 500 babies and 500 small.
All depends on what you intend to feed though. I currently have 2 x 9 month old pygmy bearded dragons, 1 x 5 month old central netted dragon and 1 x 8 month old central bearded dragon so I need the smaller 2 sizes so I can feed straight away but if you have larger animals you could get away with just getting adults.
I'm buying my woodies off Jemmi Woodies and if you PM me your email address I will forward you on an email giving you all the details if you want to purchase from them.