The Las Vegas MLS system is indicating a seasonal changes. It seems that as the weather cools, so does the desire to sell a home. The cycle is pretty predictable, as indicated by the listing graphs.
There are some great tools to take advantage of in the MLS. Get with your Realtor to see the features. Agents can track homes sold, homes for sale, price averages, days on market, etc. They can also locate a home by area, including zip code, street, community, and arbitrary radius or rectangle. The Multiple Listing System really is the best way to find available housing as it relates to other options. Its reports are invalueable.