coax is coax mpyw, you don't need to spend tons on a cable. Some actually make their own cables out of RG5 or RG6 coax, through some RCA connectors on each end and your done. As John mentioned Monoprice is what many of us use in the states, if they ship internationally, that would be a good option. I purchased a 25ft Component and 25ft HDMI cable from my projector for less than $50 total.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85