Vickie - Availability will not be a problem and since Boise has a less than 2% rental vacany rate, it is a good time to become a landlord. But, if you are trying to cash flow you will want to remember that the loan on this type of property will probably require 10-20% cash down. Then you must consider your monthly payment, taxes, insurance on all units, HOA fees, utilities, income tax, property management (if any), etc. Even though a property may seem to be cheaper because of the price things like taxes, utilities, vacancy losses, HOA fees, etc. may actually make the property a more expensive investment. Ask questions like "does it have seperate meters" and "are taxes figured on individual units (as in townhouses) or single tax record (such as duplex)". I recommend this website for calculating your Cap Rate and investment potential. http://www.realestatecritic.com.
I use it all the time and it gives great reports that are also helpful to provide your lender when applying for the financing. Good luck