Button 'lives'

Hey everyone I was doing some cost estimates on using fabric ribbons for the lives. 

for thin single colour ribbons we are generally looking at $0.30/meter

if we have a total of 500 buttons (100 of each different colour) 

and the lives are an inch long

and there are 3 lives per button

the total would be $11.50

not very expensive and they look nice

also I went to a thrift store and found a few roles of ribbon for $.99 

I only saw red and green...so I could pick those up if we go with ribbon