Since the OP has been here for over a decade, I suppose I can break the news...  It's not that those hot deal sites are getting "meh."   It's that because of the proliferation of such sites that companies no longer have to have such steep discounts to encourage new buyers.   That, coupled with the realization that customers aren't loyal.   Selling them things, while taking a loss, doesn't lead to lifelong customers, it leads to you going out of business (see dot com collapse.)    Though, in the late 1990's, very early 2000's, it was great while it lasted.   
Hell, I still remember having to fork out money for a large shelving unit just to hold groceries.  If I recall correctly, if you bought 10 items of a particular brand (betty crocker, or something like that - there was a large variety of qualifying items) you got a $20 or $25 gift certificate good for your next shopping trip.   Well, the next day, out of curiosity, I bought 10 more items to see if that gift certificate was good to use on those items.   Son of a bitch!  I got another gift certificate!  Free* groceries - all I had to do was go back and forth from the car, 10 items at a time.
*Actually, I think for the combination of qualifying items I got, it cost me about $1 each trip.  And, it might have been 15 items.  Regardless, I spent 10 times more money on shelving than I did on groceries.   I had enough cake mix and frosting for what seemed like a lifetime.  "Bake sale?  I'll bake some cakes."
Or, Staples: a scanner, plus about 6 other particular items added up to $150.  You used a $30 off $150 coupon, and after the rebates rolled in, you netted a $12 profit from those items.  
Or, the Dell computer right around Thanksgiving, I think it was 2000, else 2001.   They used to have all sorts of separate rebates.  If you bought a computer with a particular hard drive, you got a $100 rebate.  If you bought a computer with another particular thing, you got a $200 rebate.   On one day, all of the rebates over-lapped.   If you were a student, you got a $2000 computer for around $100.   Dell shit bricks, but honored most of the rebates, provided people could verify they were students.   IIRC, most people got back the majority of their rebates, resulting in a net cost of under $500 for the system.
*sigh*  HOT deals are mostly a thing of the past.