if you are thinking of profits, probably it takes ages to ROI because of maintenance costs and difficulty levels.
Why not to deploy your own mini-farm, especially if you have an access to free (better) or (simple) cheap electricity? ROI will be about 1 year, may be 6-7 monts in case of free electricity. Try to use some bitcoin mining calculators.
If you are just trying it for fun, lets try mining with your computers GPU if you have one, or buy a USB miner for testing.
Here is again the reason to buy S5. It will give you a little amount of BTCs (about 0.02/day), and I boubt GPU or USB miner will.