You're not going to find good prices on 98% of what you see, imo.
It took me 6 months to find a 2013 @ $600 used that was msrp new of $1550. That is just about the only decent deal I have seen.
Although near me now there's a Scott CR1 Pro thats a bit older and is $1000 asking when it was a $3000 msrp bike.
Best thing you can do is find a year or two old $2000-$2500 msrp bike and then when it's priced at $1700 or $1800 offer the buyer $1400-$1500 for it and hope you come out on top with a win. That is basically my next strategy / what I plan on doing if I'm shopping for what the bike that I have now does not have (carbon, ultegra).