I can't recommend vadai enough. The small 10L barrel I got from them never leaked. Before I knew about Vadai, I got a few sizes of American oak barrels from a couple places in TX/Mexico, and almost all had to be replaced twice. Staves slipping out of place, horizontal cracks, all kinds of things. The good thing I can say is that they had excellent customer service and replaced the barrels. But given that they are half as thick and have more imperfections than vadai, I wouldn't really recommend.
Of course, a Vadai isn't that helpful to you if what you're really looking for is an American oak profile