Six two-bedroom town house units priced at $168,000 have recently become available in the Hartwell Farms affordable housing complex on Hartwell Road. Those who meet income eligibility requirements for affordable housing can submit applications for a lottery to be held in late November. An informational meeting on affordable housing opportunities is scheduled for Sept. 10 at 7 p.m.  in the Bedford Free Public Library, 7 Mudge Way. More information is available at the library and Town Hall, by calling 781-329-8201 , or at www.affordablehomesbedford.com.