According to Trend MLS here are some stats for Whitpain Township which included Blue Bell in Montgomery County for the past few months:
In October 2008 there was 27 units listed for sale with an average list price of $691,693. During the month there were 14 units under contract and another 10 that sold. Average sale price for sold listings was $361, 052. Days on market stood at 127.
For November 2008 there were 20 new units listed with average list price of $492,922. There was a slow down in under contract units with 8 but an increase in units sold at 17. The average sold price was $396,648 for the month and days on the market decreased to 93.