From the owners:

“Again, no tricks and only treats! The only change for the MMP annual sale will be the dates. MMP’s Spooktacular Sale will be conducted from Friday, October 28th, 6pm Eastern Time through 11:59pm Monday 31st, 2016. Happy shopping!”

The list:
A Most Dangerous Time [$25]
Angola [$42]
A Victory Lost [$20]
April’s Harvest [$17]
Action Pack #6 [$20]
Action Pack #9 [$19]
Action Pack #10 [$11]
Action Pack #11 [$14]
Action Pack #12 [$9]
ASL Journal #2 (reprint) [$28]
Best of Friends [$9]
Beyond The Rhine [$74]
Bloody Ridge (ziplock) [$11]
Breakthrough: Cambrai [$22]
Champion Hill [$17]

Day of Days [$66]
Decision at Elst [$36]
Guadalajara [$19]
In Their Quiet Fields [$18]
Karelia ’44 [$24]
Kawaguchi’s Gamble [$25]
King Philip’s War [$25]
Korea: The Forgotten War [$50]
Leros [$22]
Lincoln’s War [$44]
No Question of Surrender [$38]
Out of the Attic 2 [$11]
Rock of the Marne [$22]
Rivers to the Reich [$11]
Salerno [$24]
Special Ops #1 [$14]
Special Ops #2 [$14]
Special Ops #3 [$14]
Special Ops #6 [$18]
Storm Over Dien Bien Phu [$25]
Storm Over Stalingrad [$25]
The Greatest Day [$146]
The Kingdom of Heaven [$44]
The Mighty Endeavor (Exp) [$32]
Tide At Sunrise [$22]
Turning the Tide [$11]
Yom Kippur (ziplock) [$11]

 

Buy them here: MMP

Sample price delta from lowest prices I could find online:

Breakthrough Cambrai $28.99

Lincolns War $52.99

ASL AP #11 $17.49

Decision @ Elst $43.39

Sadly no new releases are  for sale. Which while understandable always feels to me like – hey here is 30% of all the stuff we can’t move!