I got a couple sway bars available for you guys.

H&R Front Sway Bar - 70643
Fits: 2004+ Mazda3 (should fit MPS)
Size: 24mm
Price: $224.10

H&R Rear Sway Bar - 71643
Fits: 2004+ Mazda3 (should fit MPS)
Size: 26mm
Price: $224.10

Hotchkis Sway Bar Kit
Fits: 2004-2008 Mazda3, 2007-2009 Mazdaspeed3 MPS
Size: 29mm Hollow Front / 32mm Hollow Rear
Price: $394.20

Prices do not include shipping. Please keep in mind these are large packages and could be costly to ship!