I'm going tomorrow to academy to buy a few cranks. Wanting to buy square bill because I fish mostly shallow stained lakes. If you could only buy 3 what size and colors would you choose.

If they have them 

 

Lucky Craft Flat mini sr in chartreuse shad

Rapala DT3 in silver

Lucky Craft DRS 1.5 in Ghost Minnow

I'd buy the H2O brand CRS and you could probably afford to buy some more that way since they're $3.99 apiece. You really can't go wrong with any of their colors but chartreuse black back, threadfin shad, bluegill, red craw are all good colors. 

Strike king 1.5 and 2.5. A darker/ red or brown color. A chartreuse and black and a gizzard shad.

Thanks for the suggestions.

Storm Arashi Square 3 in Rusty Craw, Parrot, and Bluegill

For stained water:

 

1. SK KVD 1.5 Firetiger

2. Bomber Square A 2" - Apple Red Craw

3. Xcalibur XCS Square Lip 100 - Creek Craw

If you are on a budget I'd stick to the CRS, they are decent quality at a decent price.

Strike king 1.5 and 2.5. A darker/ red or brown color. A chartreuse and black and a gizzard shad.

Same here.

Oh yeah, forgot to say if the water is real murky, the SK KVD 2.5 is better. Bigger is almost always better when there is little visibility.