Well, there is ebay.ru actually.
Neither do I. However, I'm not sure that vk is a great platform for trade. Some use molotok.ru but mostly for "paraphernalia". ebay.co.uk is the most handy as yet.
I don't know if molotok is fordesque enough I have some things like G&H SCs and AS shoes which I need to sell, but do not know what to use either.