I finally succeeded purchasing SVO to VVO tickets on Aeroflot through Aviasales with a US Visa card after many attempts.
I had to purchase one up from the most basic economy fare (lowest fare listed is for Russians only) and a credit card worked vs debit card did not. I tried about 6 times my final attempt, but it did finally go through.
Wingie was my only listed option for purchasing site. I paid extra for sms messages regarding my flight and also paid the extra for "prime support" in case of cancellations and to receive emails about flight. But, success!!! If at first you don't succeed, try and try again!
MPA