Cost of Rat Control

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I looked through a few of the previous forums on rat control and found a few interesting stories, but nothing regarding professional costs for the treatments.  

One of my tenants reported a rat under her sink, we had a professional come out and do an emergency check - Here are the exterminator's notes:  

 It is indeed a single rat and its access is from the crawl door being left open. It's shut ( 2 days ago). It's getting into the unit 2 under the floor of the sink, not actually in the under sink, but the void area under the floor of the sink cabinet. Kyle should put steel wool under the floor of the sink in that area and go under the structure and find the access point near that kitchen area. I did not crawl the unit.

Exterior rat stations are needed- I suggest 4 of them installed at $500 and a follow up refill in 30 days for $125. Cheaper alternatives are avail too but this is my recommended action. Please approve by replying to this email or sending a work order with authorization for $625.

I'm a bit confused as to the cost of these traps, it sounds expensive.  I expected a few snap traps and be done with it.  I'm open to any sort of guidance that can be provided, I have a conference call with the property manager Thursday.