First of all I would also say sell the bike and buy a hybrid. You can probably buy a decent hybrid for the money you get selling this bike.

But if you want to do the swap cheaply, SRAM MRX comp shifters will work with Sora. You just need to get the model with friction shift for front and 9 speed rear (assuming your Sora is 9 speed).

Those shifters are cheap and come with cables. Than you just need brake levers and cables and bars. Depending on how cheap you go with parts you might be able to sell your Sora brifters and break even.

I did same swap on a bike for my wife with 8 speed Sora