Has anybody seen any copies of Game Merchant magazine? Any comments?

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GameMaster catalog, so should be different.
However I am also interested in any information on the Games and Puzzles magazine from the UK which should have ran from the 70s to 80's till whenever.

ShaneG.

I have those two plus about 6 others stretching into the teens.
Guy, I recently bought a games & Puzzles that had an article about D&D in it (about issue #48 from 1976).

Yes, Games & Puzzles #48 has the Dungeons of the Ground Goblins article, which is largely (if not entirely) the same as the version published by People's Computer company, and the GW versions. Zenopus cataloged a bunch of info here:
The Dungeons of the Ground Goblins - Zenopus Archives

Notably, the version in Games & Puzzles is probably the first non-TSR published D&D scenario ever, at least based on the 1976 May cover date. (Beating out F'Chelrak's Tomb, Palace of the Vampire Queen, and the "first level dungeon" in Chimaera #18 by a month or two.)

Admittedly we are getting way off-thread here (the sources for Dungeons of the Ground Goblins have nothing to do with Game Merchant), but:

That issue of People's Computer Company on eBay is not the right one. You are conflating the month & year of the relevant Games & Puzzles issue (1976 May). The correct People's Computer Company issue is 1976 Aug/Sep.

You can download pdfs of most/all issues of People's Computer Company from the Computer History Museum site:
People's Computer Company; People's Computers; Recreational Computing | 102661095 | Computer History Museum

There are other issues with rpg content.