I had the same problem, to the point that I started a company to import Ecococoon cups from Australia! You can now get Ecococoon stainless steel cups in the US - they have the brightly colored jewel tones and lots of cute designs also. www.leave-happier.com/ecococoon
We have been using these cups and drink bottles in my house for several months now - love them! No off taste, clean up well, and the bottles keep drinks cold in this summer heat all day. Hope this helps!
I am so happy to see these! Will probably be placing an order soon...
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25yo FTM to a Wiggle Panda , student teacher , newlywed