We have the Milgard Quiet Line
http://www.milgard.com/catalog/windows/series/quietline/windows. Any Milgard dealer can get them. This industry has very tightly controlled ad and distribution networks. You will be challenged to find prices online. The manufacturers set "MSRP", but actual prices from dealers are much less...about 50% less in my case.
Can't help you with installation. Like I said, "our labor is free", meaning my wife and I are the installers. It really is not that hard...break the seams to the inner and outer wall, remove the 5-7 screws holding the old window in, replace with new window and secure with 5-7 screws. Then it's just caulk and cosmetics. Our dealer did say they could install them for "probably about $100-150 per window". I'm happy to make that in my spare time.
There are a few details you'll need:
Rough frame opening size of the windows. You can just guess if you're only looking for a quote, but keep in mind prices are tiered. 28-34" might be 1 price, but above 34" the price might be a big step up to the next tier.
New construction or retrofit. Make sure they quote you for retrofit windows, which have an external flange to seal against the outside wall (unless you really don't want a visible flange and don't mind redoing the exterior).
Tempered glass costs more. Any windows in bathrooms or below a certain height need to be tempered. Check the building codes for specifics as I cannot recall them.
You can opt for obscure glass, which lets in light but isn't see-through. Good for bathrooms.