I've never been to a sample sale but have made some pretty good finds. Most of my bags were purchased on sale but I think my best score to date was my Currant HH Nico XX Hobo from the boutique for $137.50, reg price $550.
Best deal - Botkier Tall Bombay Hobo - $650 retail? $299 BIN on ebay
Kooba Carla in Brown - $750 - $219 at Off Fifth
Kooba Sienna in Green - $695 - $195 at Off Fifth
Isabella Fiore - $650 - $223 at Off Fifth
Michael Kors - $398 - $123 at Off Fifth
Hayden Harnett Olive Inka - $425 - $123 from HH labor day Sale
I think that's the bulk of them! Off Fifth has the best deals!!!
Hayden Harnett's Triple C Satchel in Currant and Lorca in Blush. I've been eyeing them and I'll just bought them from the recent sale. From the advice of some tpfers here, the triple C satchel is a good buy at $179++ plus those tassles are less than $6!! So I just grabbed the chance and do it! But will have to wait slighly longer for shipment due to overwhelming response for their sale.