Can you give a description of what your company is doing? For lots of one-off work, freelancer or something similar might work. How complex are your UIs? Are you doing design in house? Where is server-side dev being done?
I'm sorry, I forgot to write about this: We're allink.ch and we do a lot of Brand and Web Design/Development. ATM we create everything inhouse, from Design, over Frontend until backend (Django). But as I mentioned above, our Frontend guys are quit busy so we're looking for freenlancers/partners.