there's some luck involved yes but if you know what brands you like and what your measurements are its simply checking in frequently looking for that deal!
I got recently a pair of hickey freeman mainline wool slacks for 44 bucks bnwt (345 retail) and a pair of zanellas for 34 bucks bnwt (325 retail).
you have over a month to get the suit that's more than enough time
+1 get good measurements and check daily for new listings of some brands. make sure they're recent models but otherwise condition and measurements are king. You might have trouble finding a solid Navy or grey but subtle patterns are everywhere.
IMO some of the best brands that are undervalued on eBay are: Canali, Hickey Freeman, Belvest, Luciano Barbera, Samuelsohn, Paul Stuart, Pal Zileri
If you're a 40R i did the work for you: Click me you lazy noob
Or be even lazier
Edited by MZhammer - 6/11/13 at 11:14am