Heroic scenarios are a great way to rack up valor too. This is the first week I've valor capped in a long time. They take about 10-30 minutes depending on the scenario and how good/well geared your group is. If you beat the timing challenges you get bonus valor too.
http://www.wowhead.com/guide=1240/mop-pve-gear-guide <- great guide for showing where to get what gear that you might need. Try to be as efficient as possible with your valor purchasing.
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