In the last year or so I've started recommending folks getting started in real estate photography purchasing used gear rather than new gear to save a bunch of money. This works best with DSLRs and lenses.
Most people think of Ebay.com when they think of buying and selling camera gear but you may have noticed that you can both buy and sell DSLRs and lenses on Amazon. Here are a few example:
Notice that on some items there will be a "Sell Us Your Item" dialog box just under the "Add to Wish List" box where you can get immediate cash for your similar item or further down there will be a "Sell on Amazon" button that will allow you to add your item for sale quickly and easily. Some people will like this immediate style of selling better than the auction style of selling on Ebay.com.
Of course purchasing used gear is best done with an understanding of what types of gear people are wanting to sell. For example right now 5DMKII are a great deal used because many people are upgrading to 5DMKIIIs. Typically you are going to be able to save more on a used DSLR than a lens. My examples above illustrate that.