There's quite a few options out there: WaveArts MD5, Waves C4/C6, Waves X-Noise, Waves Z-Noise, Waves WNS, Waves W43, CEDAR DNS(1000,1500,2000), Cedar DNS One, Dolby Cat .43, Sonic Solutions NoNoise, BIAS Soundsoap, Algorithmix reNOVAtor, iZotope RX, DINR, Zynaptiq Unveil - and probably a host of others.
Noise suppression is a dark art, in that most of the time 'we're shooting into the dark' as to which tool or combination of tools to use under varying circumstances. The price ranges of these vary (from $100-$7500), as do their alogrithm basis (some are FFT, some Spectral, some Expansion), and depending upon what you throw at each one, each will provide varying degrees of success or failure. And that's where it becomes an art - figuring out the high points of them and playing to your strengths.
My personal favorite is the CEDAR DNS, it's quite amazing, but on a regular basis the Waves C4 is my workhorse - and it's quite soft on the wallet while being a pretty good catch-all for most broadband noise problems without creating digital artifacting weirdness