First off, it's probably worth noting that the website you bought from doesn't look like an official DC Comics site. I think you're buying from a third party or a middleman, so you probably can't put the blame on DC. If the books still haven't arrived by the end of the month, try contacting the website or see if you can get a refund of some sort.
That being said, if the website said 'mails every other month', it probably means that the books won't arrive until some time in December. What 'mails every other month' basically means is that the comics will only arrive every two months (e.g. you order October, skip November, arrive on December, skip January, arrive on February, skip March, arrive on April etc).
Hope this helps
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