Looking for cheap fire-pit ideas

Not sure how much you would be willing to pay, but Lowes has a fire pit kit for about $200 dollars. Includes stones and steel ring. You could just purchase the stones and not use the steel ring. This would be cheaper. But I recommend having the open metal fire ring and the stones. Also, I would not recommend glueing the stones together in case you decide you want to move the fire pit.

Not sure where you live but the two easiest ways Ive done a fire pit before are 1: simply dig a hole and burn in that or 2: Use rocks from the woods around your house to build a ring. Both cost nothing and function perfectly well. If you are looking for an inexpensive way to build something then you can do what I did this time. My fire pit was built with these:

http://www.homedepot.com/p/Pavestone-RumbleStone-10-25-in-x-7-in-Cafe-Trap-Wall-Block-92369/203158385

You only need 1 or 2 levels and i did not use any mortar- just stacked and burned!

My cousin cleared a 5ft circle in his back yard and used curved pavers/edgers stacked 3 high around it to create his fire pit. It makes an awesome place to hangout.