camera to pc convertor .

[Who me ?]

Simply - got a CCTV camera which I would like to use to cover front garden and record on PC as I've got oodles of space on one HDD .Camera output can be Skart or phono -so I presume I need a phono ( analogue ) to USB convertor .Any suggestions of something cheapish that works .Anything I've seen on the likes of Amazon have poor reviews ,and Maplin are as usual a bit on the pricy side .