If you haven't cut the 2x8's, my recommendation is to take them back to Lowes, and find a place that sells Weyhauser Framer series. http://www.woodbywy.com/lumber/weyerhaeuser-framer-series-lumber/ Lowes is great about returns. There are no questions asked.
I've worked my entire adult life with SYP. Even the framer series stuff will move some, but it's WAY better than the big box store YP. You still have to pick through the stacks to get straight grain, and no knots. Take a helper with you, and restack the boards neatly, and they won't mind seeing you coming the next time.
Most of these suppliers will have lumber racks outside that you can drive up to, and are a lot easier to handle the boards than Lowes or Home Depot. I hate buying lumber in those places.
When I buy such lumber, I take my two helpers, and the trailer if we are getting more than will easily fit on the back of the pickup. We park where it's not more than a couple of steps from the stack. The trailer gets parked right beside the stack. When using the truck, it gets parked right beyond the stack so boards can be slid in.
I sit at one end, pick up that end of the board to look at it and sight down the edge. I lift it up if I want them to take it, and move it sideways if it's a reject, and it gets laid on the ground. We restack the lumber off the ground when we leave. When the guys on the yard see me coming, they just wave, and check the load before we pull out of the gate, like they're supposed to.
Ahh thats bummer man.
I had a bit of a day too. On one hand, the bandsaw is up and running. On the other, replaced the pulley, key and set screw on the jointer, flipped the switch and the motor is completely dead. So eff that.