Any so long as its whey protein with at least 20g protein and no more than 2g net carbs per portion. Myprotein (.com I think) is a good site as you can buy sample sizes, which is worth doing as they come in massive tubs so a lot to buy if you don't like the flavour!
Another option is protein shots, which come in a test tube shape vial, and are like squash. You can buy them individually from holland & barratts or in bulk online, but check the carbs as some of them are energy ones with loads of sugar in them too.
There is a great old thread on here somewhere by phatgirl called where to buy protein shakes or similar with loads of info and links in it.
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