Hi there,
As a current R1200GS adventure owner who just picked up a 2013 Super Tenere, I was in need of some accessories. I negotiated 20% off parts when I bought the bike but found that Westfield Yamaha's online pricing was considerably better. They also have flat $7 shipping for most (not over sized etc) items. I have no affiliation with them whatsoever, but they gave me good prices so I ordered the following from them:
1 of 23P-F84B8-T0-00 - Yamaha - SIDE CASE RIGHT @$344.51ea.
1 of 23P-F84B8-V0-00 - Yamaha - SIDE CASE LEFT @$344.51ea.
1 of 23P-H29A0-V0-00 - Yamaha - GRIP HEATER KIT @$299.48ea.
1 of 23P-F84G0-V0-00 - Yamaha - SIDE CASE MOUNT KIT @$142.35ea.
1 of 23P-F43B0-V0-00 - Yamaha - ENGINE GUARD KIT @$344.51ea.
1 of 23P-F14B0-V0-00 - Yamaha - SKID PLATE @$153.71ea.
2 of 23P-F847U-V0-00 - Yamaha - INNER BAG FOR SIDE C @$36.62ea.
For the prices I saw that were listed, these guys were cheaper. Not sure if that holds true for everything though.
I found them on google and the web site I used was
http://www.onlinecycleparts.com/
Once I get these installed I'll give the bike a good thrashing and see how it stands up to the GS. I was up in the air between the KTM Adventure, Ducati Multistrada, Triumph Explorer, and or another GS. Hopefully it'll be all the fun of the GS but much cheaper and more reliable!
Have fun and ride safe!