I bought a bookmatched 4a quilted maple cap from craft-supplies a good while ago. It was more or less the only piece they actually had in stock at the time, and it has two small cracks near the side in it (which I was told about on the phone, and given a discount) before I actually placed the order. Now i'm no expert, so I don't know if the figure on it qualifies as 4a, but it is a very nice piece of wood, which I will be using for a guitar at some point.
Their customer service and delivery times are fine, the woods you're sent can vary slightly, but i've never yet recieved anything I've been unhappy with.
That said, if you can get to a lumber yard, or are happy to order from any of the other aformentioned places, give them a try first. Craft supplies is not the cheapest, or the best place to be buying wood from.