What are you looking for? The majority of them are >$200, the only ones that are $300+ are variable focus...
The camera you cite above Nelly's has the 4mp version here for $170
NSC-2X4-BT 4MP EXIR IP Bullet Security Camera 4mm - IP Cameras - Hi-Def Cameras - Cameras - Nelly's Security
Here is the 4.1mp version from LTS which you can work with milkisbad to have access to but you will only save around $10 going this route over Nelly's:
Platinum Fixed Lens Bullet Camera 4.1MP - 4mm, CMIP9142W
Note that the ebay auction you reference is out of Hong Kong. This "Most likely" means that you are getting a gray market camera that has flashed/hacked firmware and will not be upgradable. This isn't the end of the world, but if you are a novice you need to understand what you are doing and this wouldn't be advised. Bottom line your cost is $130 with shipping on that ebay auction, or you can buy from LTS or Nellys for $40 - $50 more and get upgradable hardware (should it be needed), a 3 year warranty, local tech/service support, etc. Only you can decide what works for your situation, however you appear to be a novice in this field, so I would highly advise LTS or Nelly's vs. the imported camera with most likely flashed/hacked firmware.