I've seen Omegas under $500 online on a regular basis, but then you have the transfer fees, so there's a tradeoff.
Sportsmans Guide has them for $474.99. CZ-USA CZ 75B Omega, Semi-automatic, 9mm, 91135, 806703911359, 4.6" Barrel, 3-dot Sight, 2 Mags Included - 640537, Semi-Automatic at Sportsman's Guide I use Ebates, so I get another 4% cash back and then 1% from my credit card, so that amounts to another $24 ish. I think I've seen them for $475 a few other places also, but not sure where right now.
That's a good price for what I've been seeing lately. 6 months or so ago I was seeing Omegas selling for ~$450 online and ~$500 - $525 in LGS's. $475 - $500 seems to be the average online price now. I haven't looked in any gun shops lately.
BTW, PSA has an Omega for $469.99:
CZ 75 B Omega 9mm 91135
$17 shipping though, so it ends up more than CZnap's link, unless you don't have a buyer's club membership at Sportsman's Guide.