They put dvd's in the Star Trek Magazines? Never saw one packaged like that.
It was only sold in the PAL regions (UK, Australia, Germany, etc). It was a small magazine with an attached DVD on the cover that usually contained three television episodes, although some issues came with one of the movies instead. The content of the magazine itself was usually something related to the episodes on the disc. More info here: http://en.memory-alpha.org/wiki/Star...'s_Edition
For the OP, the thing to search for is 'Star Trek The Collector's Edition DVD'. But as you said, they ones related to the original
series are more scarce on eBay, the TNG releases are easier to come by, but a quick look through just now has revealed to me one or two of the TOS releases. Happy hunting!