Logitech G105 + G9x + G35 Gaming Bundle $185 + free shipping @ Logitech Shop
Individually, the mouse is a bit cheaper at Computer Alliance (see below), however LogiTech's prices on the the keyboard and headphones looks good.
Here are some price comparisons:
The G9x is $56 at Computer Appliance, $75 at Cplonline and $97 at Scorptec.
The G105 is $49 at Computer Appliance, $54.60 at Top Buy and $63.19 at Digitalyes
The G35 is $104.89 at Mighty Ape, $119.90 at iibuy, $128 at Big Ben Computers and $132 E Global.
All prices including shipping costs.
If you were to buy the items separately from the cheapest retailers above, that would work out at $209.89 vs LogiTech's bundle price of $185. So it the offer is competitive and you save yourself the hassle of having to purchase from three different sites.
Logitech have a few other gaming bundles on offer too which may be of interest.