Is this mixtape rare given it's self-released?

Yes, as a Not On Label, self-released CDr from 2004, it holds significant niche collector value.

What is the format of this album?

The item is available in CDr and Mixtape format.

This release falls under the Latin music genre.

Name: DJ El Niño* – Reggaeton Volume 12 (CDr, Mixtape)
Brand: DJ El Niño*

Latin

What Reggaeton Volume 12 by DJ El Niño* is worth on the used market.

Label · Not On Label (DJ El Nino Self-released)Format · CDr, MixtapeGenre · Latin

Used

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New / Sealed

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Price data verified against · 1

Reggaeton Volume 12 by DJ El Niño* (2004) on CDr, Mixtape. The Discogs marketplace floor is null with 0 copies currently for sale.

Pressing, country, and condition (media + sleeve) move vinyl/CD values the most — first pressings and clean copies command a premium.

Is this mixtape rare given it's self-released?: Yes, as a Not On Label, self-released CDr from 2004, it holds significant niche collector value.
What is the format of this album?: The item is available in CDr and Mixtape format.
What genre does this release belong to?: This release falls under the Latin music genre.