Ash Creek makes some cool looking new garden homes, but they are all NW and kind of far out...
Ash Creek Homes - Austin area homebuilder for over 25 years (toro creek and the ranch at riverplace might be nice.
Closer in, but not REAL close in --
There are some older ones off Far West on the west side of Mesa Drive, Meadow Mountain I think it is called.
There are some in Lakewood off 360 just south of 2222. There are some connected as well as detached. Different styles and ages.
Also, Cat Mountain has some garden homes and near-garden homes (small lots). Some have 2 bedrooms, which usually means they are priced much lower than the 3br ones (but still the same great location).
Courtyard also has some (360 & Courtyard Dr next to tennis courts), as does Davenport Ranch .. near 360 and Westlake Dr.
There are also some high-dollar ones off Westlake Dr, east of Davenport... but they are large sq ft. The name of the place escapes me. They cost as much as regular houses in Westlake.. but not as high as Above Stratford, I would guess.
Finally, someone here posted about some in Senna Hills in the Westlake area (a bit farther out on 2244 though).
All of those are in really great locations. Sorry I don't know of any detached garden home style areas in Tarrytown or Clarksville or somewhere closer in. There are some really nice attached townhomes there.