Sadly a lot of real estate websites are still stuck in the old traditional days of doing business and they aren't transparent (i.e they still withhold information forcing you to call) but there are some really good one's out there that give you access to every property on the market and give you agent-level property information.
Here is every property available in Lexington:
Deb made a good point about new construction in Lexington condo's. If that is what you are looking for you might be limited. That said there are some great updated condo's on the market in Lexington.
First question is, what do you mean by decent? I live and work in Lexington & know that of the 27 listed on MLS, 5 currently have accepted offers, and 1 is in process. If you are interested in this area, best to get a Buyer Agent to represent you. Unrepresented Buyers are flying blind and take a long time to catch up, if at all. It doesn't cost you anything - just don't sign a contract until you are sure you are working with someone who really does have your best interests as a priority and that you are comfortable working with.
I'd be happy to talk with you more about Buyer Agency, Lexington condos or if you are looking in other areas as well, refer you to Buyer Agent in that area. Just call me - 781-771-4282.
Accredited Buyer Representative
The Duncan Real Estate Team