I've been using skim milk for years for my protein shakes and just today I bought my first litre of almond milk to experiment with making the change. It's 3x as expensive but I may be able to half/half it with water. I'm feeling bullish
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I'd recommend trying oat milk too. It's cheaper than almond (usually) and much creamier, but there's not much protein either.
If you're amenable to soy, soy milk has a lot of protein, and the taste/creaminess is good.