does anyone know if you can go to pick up an order?

do they have a minimum order for walk ins?

I've never ordered from Sysco, but if they are anything like Bakemark (another distributor) they probably don't have a minimum order for walk-ins. To clarify, it's not really a "walk-in" order, for Bakemark I had to call in advance and place a will-call order, which I was able to pick up later that day. I would assume most distributors work that way since they don't have retail space.

You will probably have to fill out a credit application though:
http://www.sysco.com/aboutus/contactus/BecomeaCustomer_send_message.html

I know here locally you can't. They used to have cash and carry buy not anymore. I would call your local office and ask, you really have nothing to loose.