Buying consortium?

I've met a few other winemakers recently, and I'm wondering if we pooled our dollars, if we could negotiate discounts on some of our supplies. The main thing I'm thinking of at this point is bottles. If we bought, say, 25 cases of bottles, could we get the price down to 50 cents a bottle? Corks, too.

Grapes are trickier, but it might make some sense to explore what we could negotiate if we eliminated the middle man, but the grape is complicated in ways bottles aren't because we'd probably have to get on the same page with a grape to be of interest to a vineyard.

What's everyone think?

Bernardo