Ebay is probably your best bet as mentioned above.
Otherwise if you are in the uk, try
www.direct-golf.co.uk or
www.golfbuyitonline.com they generally have some of the better deals on golf equipment.
Best bet is to find the bag you like then use
www.pricerunner.co.uk to see what the cheapers available price is.
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Titleist 983k - fujikura stiff shaft
Taylor Made R7 Steel 15* - Re*ax stiff shaft
Mizuno MP32s - S300
Mizuno MP T Raw Haze 51*, 56*, 60*- S300
Scotty Cameron Red X - 330g