hmmm.. first u must already beforehand shortlist what u wan to buy, coz no time n space to jalan jalan at leisure.. i usually go early on sunday n park my car at suntec or marina, then go for brunch, before 12 start to move towards the exhibition halls and within 2hrs i am out of the place coz thats when the crowd start coming in.. this is my usual tactic la!
As for buying of tvs, i seriously think there are alot of good deals around with those hourly specials and etc. if u wan cheapest price, juz tell the sales u wan to forgo all the feebies like vouchers and they r usually flexible enough to deduct the equivalent cash value from the selling price lo.