Approximately how much will silk flowers cost?

I really don't care about flowers. They're just not my thing. Therefore, I really don't see myself paying a lot for them. All of the other decor (including centerpieces) is flowerless, but I don't see myself getting out of carrying a bouquet. I'm pretty crafty though and after watching several tutorials online I am very confident that I can make my own. I'm going to make them out of silk flowers so that I can do them a head of time. How much do you think it would cost to buy the flowers for 1 bridal bouquet and 3 bridesmaid bouquets?