Not only have I managed to find a Soviet "Syriyka" tunic which actually fits me (judging by the availability of surplus sizes, the average Russian is/was in 70's-80's a fair bit shorter than me and, if they were as fat as me, usually really short), it is in the UK, subject to free shipping, and cost...
...a tenner!
I also got an empty fag packet for £1.50 and Officer's Cap Badge for £3.00 (to make my KGB dress uniform visor cap authentic with the Officer's Coat I have (which some penis has put air force shoulder boards on along with the KGB collar tabs, grrrrrr V^^V).
Can't help but recommend sovietstores.com!