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Have a look at this.

I've never seen RB on DVD in Spanish before, but here she is. It's a four DVD Set for Region 1, so it can't be watched in Spain... Audio is Spanish and English. Personally, I think it's expensive for what it is.

Now we have the Rainbow Brite cartoon episodes in English, French, German, Italian and now Spanish. Does anyone know of some that I missed?

http://cgi.ebay.com/RAINBOW-BRITE-Tierr ... 1c13ae22e6

That's the same DVD set I mentioned in this thread:

viewtopic.php?f=15&t=1180

It's from Mexico, not Spain, which is why it's Region 1. But I think you've listed all of the available languages.