Looking into clipless and was wondering whats the cheapest pedal/shoe combo to start with

Shimano M520 pedals are fine for starters (though it really depends on if you skid or have brakes), but shoes you really shouldn't skimp on, head to a few local stores and try everything on until you find some you like, and hope that they're on sale.

REI is having a sale on all shimano pedals and shoes. 25% off I think.

Good parts aren't cheap.
Cheap parts aren't good.

Maybe you should ask, "What pedals and shoes are the best value for my hard earned money."

I don't know the answer, but I just wanted to help you get better answers. I'd shoot for used pedals. You can usually get them for 75% down to 25% of their original retail value. Same for shoes.

A better question would be, what clipless system should I choose based on what I want/need.

I have a front brake and don't skid much