In think true nutrition (old name true protein) does a few (or they used to when they were true protein), not sure about anything like import taxes etc. Have a look at http://www.truenutrition.com/ - just had a look & it seems you can get hemp, pea & rice proteins from them - if you do buy & you get a chance, could you mention we sent you their way.
As a side note it looks like you can order a mix if you like to mix proteins up a bit (personally I don't mix, I vary each day just so the amino acid profile I get everyday is just a little different, I use hemp, pea & rice proteins - as I eat soya I tend not to buy soya protein, I change up which one I eat daily, so my body has less chance of developing an intolerance & I get different amino acid ratios each day).
I'd guess you might get a better amino acid profile if you mixed, but I think I tend to get easily enough protein so I prefer changing things up a little everyday, but I do know people who do use the same mixture every day without any issues.