well are you going to be sewing your bows or using wire? If sewing get strong thread like upholstery thread which you can get a joanns not sure HL carries it, but i'm sure they do
Alligator clips...can be purchased at Sally's Beauty Supply
Ribbons Ribbons and more ribbons....i think your best bet would be to purchase on line from either http://ribbonandbowsohmy.com/
also if you sign up for Ribbonand Bows newsletter they tell you when they have sales...same with the ribbon retreat....