For the 30 days I was in Cuba, I had budgeted to spend about $2,000 CUC. I ended up spending only $1,300 CUC. I was able to cut costs by sharing a room, cooking meals in my casa and I also took advantage of traveling like a local whenever possible.
I did however, buy meals or drinks for my Cuban friends so, that did add a little extra to my trip expenses. I was happy to do it though being so under budget.