Where can I find this manga: Ginga Sengoku Gun Yuuden Rai, also known as The Heroes of Galaxy Wars or Thunder Jet? I've been looking online for a place to buy this, but cannot seem to find it anywhere.
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You should check out the YesAsia website.
It has several volumes of the manga you requested for sale for around $12 (€9). These releases are only in traditional Chinese and Japanese. As for English copies, I do not believe there are good sources to buy from as of now.