Here i myself have network of those friends who are using bitcoin and Etherium coin for buy and sell at the offline market .
At offline the rates of these coins are small low , so better to have the coins in offline market , but in small amounts .
But I don't think that you should think about these things because these are not a better way of dealing with cryptocurrency because if we are making earnings then we needed to make buy sell in online and also we should pay all the tax to the government because to pay tax is a better way of doing this job in virtual currency because after pay of the tax we don't need to take tension for the future that we will needed to face any problem by the government officers about the work that we are doing.
But still if you want make connection between those who want make offline deals then you can found them at local bitcoind and at social media but you will needed to meet them at offline and also to have trust because all these in this field depends upon trust .