Currently Tesco finest Greating card range is Buy One get One Free instore.
When this goes through the tills not only does it give the BOGOF but also a line on the receipt under this indicates that that you get 50% back as well.
This equals free when you have been through the till.
Worked today in two tesco extra stores though the card range is poor.
Credit should go to Welsh-Dragon on PTS website as her post made me try it.
Now have loads of finest cards which i dont think that much of really but they are FREE.