I got some from eBay, red ones from Poland. And they were absolutely amazing. I ordered the harder compound and put on a light/medium grind and they were really good, modulation and brilliant hold, a bit more bite with a sharper grind. Cheap as chips too.
These ones
£17 all in, you'd end up paying nearly £15 just for the backings. I used that compound up and stuck my LGMS in there with ease, but my brakes a bit more bitey now, loads of hold though, as with most vees.