Fair price in canadian funds for a used gtx 780 lightning?

[xToFxREAPER]

So my second gpu finally came back from rma and while it was gone i realized i just dont have huge amounts of time to spend gaming anymore. Seeing as how i dont yet have a waterblock for the second card (my dads in Europe right now for a month and will pick one up from the ek home store if i ask him to) That being considered to physically fit it into my system i would NEED to water cool it because if i dont my reservoir is just to tall to fit it in. Now considering i would have to get the second block and ek fc terminal link and a bunch of fittings and more coolant im looking at $300+ to get the second card added in. As much as i want to do this and love that sli and surround performance i know damn well im not gonna get enough use out of it because of work and gf etc to justify that extra cash.. having said that and considering its just come back from the rma center in damn near like new condition (tested to make sure it didnt come back doa of course) Whats a fair price for the card?