I can boost on EUW/EUNE/TR/RU.
Here are my initial prices :
Bronze : 3€/division
Silver : 4€/division
Gold : 5€/division
Platinum : 8€/division
I can also occasionally boost on Diamond 5 - Diamond 3 divisions , price is negotiable then .
If you are interested , please message me on Skype : cristov2010
Wish you a good day