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Getting an apartment photo ready takes the right photographer as reported here in the NY Times:
As for a listing of photographers to contact for pricing
Pricing listed here for agency which seems to be less:
Some other options from the article listed below from MSN list services to post pictures that are inexpensive. From the article below:
Most Multiple Listing Services allow several photos in their online listings, and classifieds sites such as Craigslist let sellers post up to four pictures. You can make additional shots available by using free photo sites such as Shutterfly, Snapfish or Picasa.