Some photogs tour, just like some Providers. Find some photos and layouts you really like from other Provider ads. Look for the photog's watermark. If no watermark, contact the Provider and ask who did her pics (and ask for her opinion of the photog).  Contact the photog and ask if they plan to tour to your area or someplace close by ... and their fees, if not posted.  
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But that does not address the cost question.  You don't want to spend any amount of money on lousy pics. You would rather not spend BIG money on great pics. Once you've IDed possible photogs based on the quality of their work, shop around among them.
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And watch out for the guys who offer to snap a few cell phone pics "for free."