I am on another group, they do group buys and have extra's of lot of things, buttons included- they are super easy to work with and I have bought a ton of things and not had any isuses. The website is InfinitelySweet : Infinitely Sweet Wholesale
it may take a day or to to get approved, but it is worth it. Hope this helps.
Remember, when you buy buttons be sure to tell her you need the tool for each size button- most popular 45 and 60 for bows....