Rubber-Bracelets.com has a nice low minimum order and great prices even for low order amounts. They offer good customization, accommodate rush orders, and shipping is free.

WristAbouts.com has some of the best pricing on lower minimum orders out there and many customization features.

Band Together has some of the best customization in the industry. They offer glow in the dark, neon and  multi-color options and a whole lot more.

The Print Box - A promotion item company that is now offering imprinted rubber bracelets with a minimum order of 500.

Reminder Band has higher prices, but that is because they have really low minimum orders or just 40 bracelets, and they're customization is unrivaled with interior printing, glow in the dark, mixed colors and 3 sizes.

Hope this info can help you. Please feel free to e-mail me if you have any comments, questions or if you know of a rubber bracelet site that should be included here.