I was back in yesterday and they had nothing of value. It is a hit or miss situation in the cull pile. My wife asked why I even look and I showed her a 10' 8X8 I had picked up a few weeks ago. Someone had asked them to cut it and they had cut it wrong. It was still whole but cut half through in two places. Regularly $25 ea but this one was $3. I finished the cuts and set them up in the ground as wide posts about 2' high. I throw at them but also put targets on them or stand targets against them as well.
It all depends on how well you throw, how far you are throwing and how low to the ground you place your targets. Soft fir and softer rounds are great if you can get them. But I even use some pressure treated stuff that is hard. If you take a 2X10 and cut it 2-3' long you can stand it on the ground against something and even if stuff bounces, it will be low and near the ground. I just try to keep my oak rounds, pine rounds full of resin and pressure treated targets close to the ground and use the softer firs and pine rounds up higher since a bounce from them would be a bigger risk. You will also know after a couple of throws whether stuff is sticking today or tending to bounce. (a function of temp and humidity). If bouncing is the norm. throw from further back where the bounces won't reach you. And any target can be covered with one sheet of pasteboard with a bullseye on it to reduce bounce to almost nothing.
I had also said one function is how well you throw. Don't think if it hits on the point it won't bounce! I have hit certain resin filled pine rounds repeatedly and the point would bury 1" into an oak stump standing next to it but will bounce over and over again off the pine resin taking out little chunks and causing me to have to straighten, sharpen and in a couple of cases even reconfigure knife points. Good luck! I just go for the softest stuff I can find as a rule and the widest boards because they can be used with little modification.
Just looking at the other posts, Hi there Christian!! How goes throwing on the Continent?