Determining Appropriate Power Supply for A System

Hopefully I have all the relevant information here…first time poster and really clueless about power supplies.

I am upgrading a battery powered robot to use 5 DC brushed motors with a max power ouput of ~200W (12V, 89A stall current). The previous design had 4 motors which had a stall current of 5A. My past experience is with FIRST Robotics Competition, and we would use these:, but the previous design used this:

How do I know what kind of power supply I need to be able to supply the 5 motors with the power they need? Does anyone have a source for cheap(ish) good power supplies capable of handling that kind of load?

submitted by /u/RoundTab1er
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