These are all Hawaii, retail stores, but here's what I've seen from visiting. Direct from the Kamaka factory, I believe they have 10% off. At Dan's Guitars, the number is something like 15-20%. And at Easy Music Center, they rock the 25% off. I haven't been to any of the uke stores in Waikiki (since parking is not the most fun there) and haven't visited Good Guys Music and Sound or that Guitar shop in Ward in a long time. But the biggest I have seen from a retailer is 25%, which is very very decent when you're getting an expensive instrument.