Does anybody know if and where i can still buy a copy of Super Manga Blast?

Well I don't know how you have copies from the 90's because the magazine was only printed between 2000-2006 with a total of 59 issues printed. You can try looking for them in comic book shops, otherwise various volumes are sold mostly on E-Bay but I found it on other websites that seemed to specialized in manga/comic selling. They're pretty cheap, about a $1.20 for most issues. Hope this helped! Here's a link to Super Manga Blast on E-bay.

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