abs wheel speed sensor price

[tunnel rat]

I recently bought an 08 4x4 4.0 Ranger. Its in great shape with only 46,000 miles. The only thing is "sometimes" when slowing the abs activates. From what I've found at this awesome site is I probably need wheel speed sensors. I saw a a video on how to change them from A1 and the cost was $150 or so for the front pair. Which seems ok to me, hell, I dont know. But then I was looking on ebay and they were only around $20, WTF. Why such a big difference and is it worth the extra $$ for the A1 parts or should I save over a $100 and get the cheap remanufactured ones?

 

[tunnel rat]

I decide to get the expensive ones. Hopefully those will "fix me up".