CSI has these two for $92.48 and it's cheaper to add some dice/sleeves/etc and get free shipping at $100 than to just pay for shipping. Miniature Market has this combo for $96.12 with shipping or just with free shipping at $99 (The games themselves are $90.17).
Massdrop's lowest price will be $85.91 with shipping.
Betrayal: https://boardgamegeek.com/boardgame/10547/betrayal-house-hill
Mansions: https://boardgamegeek.com/boardgame/83330/mansions-madness
Be sure to pick up the revised versions of the rulebooks for Betrayal, which are available direct from Avalon Hill's website or hosted on BGG.
Massdrop's lowest price will be $85.91 with shipping.
Betrayal: https://boardgamegeek.com/boardgame/10547/betrayal-house-hill Mansions: https://boardgamegeek.com/boardgame/83330/mansions-madness
Be sure to pick up the revised versions of the rulebooks for Betrayal, which are available direct from Avalon Hill's website or hosted on BGG.