In Ebay you can get them brand new less than 500 right now and there are a lot of them,you can also find them there with a very good price pre owned,I don't know if they have been used for mining but judging that they were removed from Dell or HP computers I highly doubt these used cards have been used for mining and the used price is 300 dollars and in a very few cases you can even find it for less.I don't know what is your import duties but right now seem that there are a lot of these cards available and at their power consumption they for me can be considered a very good deal at these prices.