RETAIL PRICE: 3 euro (1000-1500 RP account)
WHOLESALE PRICE: 1 euro (1000-1500 RP account)
If you're interested in wholesale price you should buy minimum 50000 RP in one time and be ready to pay via btc / eth.
At the moment i have: 200000 RP on NA, 0 rp on EUW
You'll able to gift skins and other stuff from this accs on your main acc. So this is the same like you're buying RP from official Riot's store, just much cheaper.