Where to find movie sources?

[serp]

Most of the time a group will say what source they used for an xvid or other rip. Usually the source is DVDR ELEKTRI4KA, R5 Silver or just R5 PAL. They're never released along side the encode. Where can I find them? I prefer better quality over small file size.

Thanks.

[lolwut]

uniongang.ru torrents.ru
and lately some sources come from spanish sites

[serp]

Thanks unrealdz!