I have suggested two.
1) Facebook Advertising. 2) BuySellAds Banner ads on relevant websites.
Can you help me out?
Otherwise: where are your prospective customers presently in their purchasing cycle? The channel you use depends on where they are.
Also, smack your employers and tell them that there is latency involved in doing e.g. creative development and negotiating private placements (which are, n.b., one thing you really want to be doing), and that two weeks before the planned sale is way the heck too late to use many appropriate techniques. There is a reason why traditional retailers start going into war footing for Christmas in early summer.
1. Advertise on Google (adwords)
2. Advertise on Bing (which is the same thing as advertising on Yahoo at this point)
3. Advertise on Facebook
4. Advertise on Twitter
5. Open an affiliate program (CJ, Shareasale, etc)
While that's happening: Run split tests and optimize every part of your conversion funnel. Up those conversion rates, lower those bounce rates and abandoned shopping cart rates. Every little bit helps.