OSH Park does pooled PCB orders; didn't have time to wait for an order to get together. You can definitely save money if you don't mind waiting up to a month for your board. Although, perhaps as pooled orders have grown in popularity, the delay isn't as bad these days?
They do two 4-layer batches a month, so yeah, the turn around can be nearly a month if your design is ready on, say, the 3rd of the month. I think the do 2-layer board runs every other day now.
