I know it looks pretty ugly but it gets the job done if you are on a TIGHT budget.
What you will need:
Samson Technologies Q7 Neodymium Hand-Held Dynamic Microphone (Google Affiliate Ad)1) foam mattress cover
(you can find this at Walmart) i got mine for 10 dollars and still had material left over.
2) A box about 2 feet tall and 1 and 1/2 feet wide.
(the bigger the better in my opinion because a little box will have too much reverb)
3) 4 picture hangers
(2 pound ones) or a few nails
4) A bungee chord or some type of rope.