Yes, use VPN gate and change your IP to Russian Federation (since this is the cheapest currency among the others). Then change your store currency to Russian Federation and key in all the fake infos required.
But first, you have to top up your wallet first before changing your store country. After the top up, once you switched to Russian store currency, the balance will be automatically converted to Ruble based on currency rates. For every purchase done (top up wallet, purchase auric cell) will have a 2-3 days cool down duration before you are allowed to make any changes to your store country. However, you are only allowed to change your store currency once every 2 weeks.
Enjoy your cheap cells and hope this helps you. But keep in mind that doing this is actually a violation against Valve's rules and regulations. USE IT AT YOUR OWN RISK. But Valve seems not taking this very serious and a lot of people are still doing it. I personally did once too and still fine.