You might try
www.shoebuy.com ... use COOKING as your coupon code for 20% off.
http://www.savings-center.com/ takes you to Savings Center where you can find coupon codes for many different online sites. You can sort by Category, then by Fashion/Beauty for a list of sites that have coupon codes listed. Also, you might check
www.sierratradingpost.com -- they sometimes get closeouts on Birkies. I know I've seen them at a few places for discounts lately, but I can't think of where. If I do, I'll post again.
Hope this helped....