For a pollen sub recipe, try equal parts of brewers yeast, sugar and bee pro.
I've also used two parts brewers yeast to one part sugar. They work equally well.
A 40lb bag of food grade brewers yeast can be obtained from the breweries for about $50. It's a spray dried, very fine grain product unlike the animal feed supplements which contain alot of other solids.
The animal feed type might work. I've just never tried it.