My search results (run on 4/30/07) are below. Here are the parameters I used: 1400+ square-foot; single-family; active MLS listing; $300,000 or less. I exclude condos, duplexes, and townhomes, even if listed in MLS under "single family."
South Austin (MLS areas 6 & 7): One. (Same as last month; different house.)
North Austin (MLS areas 1B, 2 & 4): 18. (Down from 21 last month.) Almost all are in the Northcross neighborhoods (Crestview, Wooten, North Shoal Creek, or Allandale). There are none in the rectangle bounded north-south by 45th and Town Lake and east-west by I-35 and MoPac.
East Austin (MLS areas 3 and 5): 50, up from
48 42 last month. This is the least useful tally -- a bunch of these houses are east of Springdale and really nowhere near central Austin. But there's not a convenient way to sort the properties near downtown from the others.