Here's a list for you: http://www.newegg.com/Product/ProductList.aspx?Submit=E...
There are a few on there that are PWM if you need that. Check dimensions; they are all 120mm, but some are 38mm wide instead of the more usual 25mm. Some of the howlers toward the bottom of the list also require considerably more amperage than usual for PC case/FSH fans, and there's at least one on there that needs 48V.
PWM = Pulse Width Modulation. It is how the fan speed on most CPU coolers is controlled by the motherboard. PWM fan headers will have four pins instead of just three.
To connect additional fans if the mobo does not have additional fan headers, usually you would connect them to a molex connector from the PSU using an adapter. Some PWM fans can "daisy-chain."