Always finding great deals on this site, most for $100 or less. I usually fill up my shopping cart and have blown my whole paycheck the minute it hits my bank account :)
https://personal.vanguard.com/us/funds/etf/all?sort=name&sort=name&sortorder=asc&sortorder=ascAll kidding aside, I agree with mandy_2002, most of what hits deal sites is consumerism garbage (high end TVs, video games, top of the line cameras, sports-fan apparel, gimmicky electronics, etc) and people get compelled to scoop it up because it's 90% off instead of questioning whether they even need a blender with 3 horsepower or whether a normal 1/2HP one for 1/10th the price would be just as functional for normal purposes.
But for rare instances where it's useful....slickdeals and fatwallet are both ok and I'll check them infrequently on the off chance there's something useful there. Fatwallet can have some good freebies in the forums, but I find it more hassle than it's worth, plus a lot of their freebies or deals are through exploiting loopholes in targeted programs where the originator didn't put in safeguards to protect from someone in CA getting a freebie meant for a person in NY.