There are people selling, you just have to find them when they're on.
Also, if you're enjoying the shaman you should consider doing a shm/rog duo. It's very effective. I've done it 3 or 4 times from low to max level. Feel free to PM me if you have any questions.
Another note would be shm/sk duo which is also good, but not as fun imo.
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Either way, the shaman could PL the other up super fast.