Nice buying experience!
I have an aging but still functional Bosch UM-3 stand mixer. And I wanted to replace just the plastic bowl for it. It took a surprising amount of effort to find the right place, but in the end, www.mykitchencenter.com  came through. The bowl itself (sans hardware which is still perfectly good) is only $24.95 and shipping to Hawaii another ~$10 via USPS Priority Mail. Here's the parts link: http://www.mykitchencenter.com/Details.cfm?ProdID=615 
I have no affiliation to the company, just reporting it as a satisfied customer.
Dave Hurd, Hilo, Hawaii