The Stamps trailed 2-1, but scored two late second period goals, including Brad McDonald's second of the game with 4 seconds left in period two. Shelby Gray scored the other, his team-leading 11th of the season.
Clark Byczynski had 2 assists for the Stampeders, and is the second highest scoring defenseman in the MJHL, with 11 points.
Swan Valley's biggest test of the season will be this coming week, when they hit the road for 4 straight, including OCN on Tuesday, and Portage on Friday.
The Wayway Wolverines picked up a victory as well, downing the visiting Steinbach Pistons 3-1. Dave Williams and Ashley Howie each had a goal and an assist, while Matt Malenstyn also found the net.
Riley Feser made 24 saves for his first MJHL win.
They hadn't lost a game on home ice before this week, but the Yorkton Terriers dropped 3 straight in their own building between Thursday and Saturday, including a 3-2 defeat against La Ronge.
Clarke Breitkreuz and Robbie Ciolfi scored the Terrier goals.
Yorkton's now on the road for 9 straight games, starting Wednesday in Kindersley. Their next home game's not until November 12th against Estevan.