Are there any tools to allow me to enter the name of one or more games and have it actively monitor the BGG marketplace and report back based on some criteria I would like to search for? Perhaps send me an email when the games I'm looking for show up for sale fitting whatever filters I deem necessary. Not sure if this is possible..
Not in the way that you think of a tool. You can go to the particular games and: (1) "subscribe" to game (look on top, right side of game entry). (2) "Edit Subscription". (3) Activate "Product For Sale:" which is the marketplace.