I think Google will help better than me. Also, see how far away your local Ren Fairs and SCA events are from you. I'm sure you'll get a better price and quality from a friend that makes stainless steel items instead of placing an online order on products you can't see and feel on hand.
You're probably not going to find them in stainless. The findings usually used for the spikes are snap parts, which I believe only come in nickle or chrome plated.