Episode 3.06: Homewrecker
Airdate: October 29, 2007
09/23 - Marshall wants to start investing in their future and buy a place, but Lily is afraid because she hasn't told him that she is a shopoholic with a huge amount of credit card debt. As they make every mistake they possibly can in buying their new home, Ted, Robin, and Barney are there to give them advice, which they promptly ignore. Source: SpoilerFix.com
Source: SpoilerFix.com