Affordable Prosthesis

1.Do you, or have you ever used a prosthetic limb in your life?
2.Do you know anyone who uses a prosthetic limb? 
3.How much did the prosthetic limb cost (USD)?
4.Have you ever had to replace the prosthetic?
5.If yes, how often would it be replaced?
6.Do you believe it is a fair price for the product?
7.If not, what do you believe would be a fair price for the prosthesis?