Kim Oberlin is a seller on ebay (or direct via email).
His prices are impossible to beat, but there is one caveat: he only sands to 80-120 grit, so if you really want to make the project look its best you’ll have some sanding to do. That being said, you’ll have to sand no matter what if you really want your project to shine, so…
If you want wood that is closer to ready to go there are lots of places, but I find Ocooch to be a really good source.