OK, in the greater St Louis area (which includes St Charles county), we do have some properties that are in the low 100's but they are typically not in up and coming areas with better appreciation and if they are, they need some work done to them. Now you aren't telling me if you need a condo, or a single family home, or how many bedrooms, baths, etc you need and that will make a difference. It will also make a diference in what area you work and how long a commute that you are interested in and if you are interested in a "fixer upper" and sweat equity over buying a home that is move in ready (may be dated, but is functional). Right now, I'm seeing a lot of folks move in, toward the clayton area, since with highway 40 going down, they are closer to work. We are seeing some "hotter" areas build up along 40 as a result (and some are in the lower price ranges depending on condition). The parkway and rockwood school districts typically have excellent appreciation, and St Charles county has good appreciation. North county does not appreciate as well. South county is good, the city is block by block. For a good solid home in an area with solid appreciation, Maryland Heights is an excellent area and it is very central to everything.
If you were to put the SAME home on identical properties in our metro area, you would find the greatest value (price point) for the home in the clayton, brentwood, frontenac, ladue areas. Then it moves out to the creve coeur, chesterfield areas and west county. From there St Charles county and south county are about equal with st charles at this point coming is a bit higher, then north county would be the lowest. The city is block by block.
Hot areas in the city are dogtown, soulard, the central west end and the loft districts.
Many builders are having GREAT sales right now, HOWEVER, if you are looking at selling while the builder is still building it can be tougher. For rehabbing, you need to ensure that you don't over rehab for the neighborhood, since you won't get your money out of it.
If you would like, I'd be happy to sit down with you and show you on a map the areas that you might want to look at, then help you set up an on-line search in an excellent program that will allow you to save the homes that you like in an on-line folder that you can put notes with (and that will update you whenever there is a change with one that you have saved). there are some excellent buys out there right now, depending on what you are looking for.