I bought a sim card off Ebay. If you have 30 days before your travel, this could be an option for you. Just buy from a reputable seller.
I got a MegaFon sim for $14, received it in 14 days and it came activated. It also came with instructions on how to use it in English. The sim expires after 45 days of non usage. I texted myself to test the sim and it extended the sim for 45 more days. You can load more minutes online. Hope this helps.