I got a few case fans that I desperately need to install. I need positive air flow, but my motherboard(Asus M5A78L-M) only has 1 fan header. So there there a cheap fan header that's 1. Reliable and 2. Under 7 dollars? I have 2 case fans but i could use just one.
Well there are these which let you plug into a 4 pin molex,
and there are these to control the speed.
You may find a fan controller on sale for your budget like this
hey, look for those on ebay
there is a sata power version http://www.frozencpu.com/products/20988/ele-1196/Swiftech_8-Way_PWM_Cable_Splitter_-_SATA_Power_8W-PWM-SPL-ST.html
2 fan on 1 molex
http://www.aquatuning.us/air-cooling/controllers/?p=3
For when you go the cheap way beyond that you get to fan controllers in 5,25" bays
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Yeah you can get fairly cheap fan controllers that work fairly well ... I'd give that a shot.
I have a couple different fan splitter (Noctua, Phobya and a "no-name" brand). They differ in type and number of connectors. The Phobya one I would not recommend (expensive and after only 3 weeks 2 of the wires came loose, I would be able to fix it but I'm too lazy).
The one from Noctua you just plug into the MB.
The Phoby is also a cable-extender (in case you want to connect from different locations, not just for example 2 front intake fans).
The last one connects directly to the PSU via molex. Got a bunch of them fairly cheap (under 10€).
I can only say for sure that the one from Noctua supports 4pin PWM, not sure about the other ones (the last one definitely not).
Edit: If you don't care about regulating the fan speeds and just want to let them spin at a constant rpm, I would recommend this one -> http://www.amazon.com/Zalman-ZM-MC1-Multi-connector-Add-Fan/dp/B000FAKUE6/ref=pd_sim_147_3?ie=UTF8&refRID=1FVJ453GJCFQ7W8F9WK2 Matches the last pic in my post.