These look good to me and are available at Advanced Auto Parts for $83. They are 4lbs lighter than the Odyssey PC-680 but are rated at 14Ah compared to 16Ah for the Odyssey. Part No. ETX15L.
http://shop.advanceautoparts.com/web...d=1#fragment-2
MagnaPower 12-Volt Sealed AGM Premium Powersport Battery, 220 CCA
Acid Included: Yes
Amp Hours: 14 h
Battery Type: AGM
Battery Usage: Power Sport
Cell Electrochemical Type: Acid
Cold Cranking Amps: 220
Deep Cycle/Starting: Starting
Height: 6.5625 in
Length: 5.25 in
Maintenance Free: Yes
Package Quantity: 1
Terminal Type: Box
Voltage: 12 v
Weight: 11 lbs
Width: 3.5 in