Thin vertical lines on my iMac 27"(late 2009)

Hi,
I know there have been many issues with the iMac screens, actually I hold my purchase for months back in 2010 because of the first issues found on the 27" monitors. I bought mine that year with a 3 year Apple Care protection plan, which expired about 6 months ago(summer 2013). After that I started to notice some thin(1pixel) vertical lines but they weren't visible most of the time, until recently that they became very obvious and present all the time(see attachment). They can be easily seen on a dark grey background, which is very annoying when you do graphic/web design.
I contacted Apple Care and they say I should bring the iMac to a near Apple Store and they will tell me how much I will have to pay to get it fixed.
I just wanted to know if there is anyone out there with the same issue that had to pay to get it fixed, just to know more or less how much can that cost. I don't live close to an Apple Store and I don't have a car, which makes it hard for me to carry such a big box and If fixing this issue is too expensive(> 500 euros), I will not repair it and live with a crappy screen.
It's an iMac 27"(late 2009), 2.8GHz Intel Core i7. With ATI Radeon HD 4850 512MB.
Thanks!

Hi,
I have exactly the same issue with an iMac mid 2010 and its the monitor itself.
I was at an Apple Service Station today and they quickly checked the iMac. Its an electronic defect and the only way is to exchange the monitor pannel. The cost would be around 550,- €.

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Thin vertical lines on my iMac 27"(late 2009)

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