I get custom mixes from protein factory
I like Heliogen Casein 60%-80%, Bio Fresh/Lean whey/ultra amino at 20-40%
I also like mixing Scivation Solution 5 with Optimum Casein Cookies and Cream
Or I make my own Heliogen Casein/Egg White/Milk/Whole Egg/IPI mix, sometimes with or without whey... Sometimes I'll add a little of Need2's whey to my mix.
Scivation, N2BM, and protein factory all have good options for whey... depending on what you are looking for.
The only casein that I like is optimum vanilla or cookies and cream or heliogen casein from pf