Kino Lorber Studio Classics announced that Barquero will be coming to blu-ray in the United States this coming April. No further details are currently available. Kino recently released Sabata on blu here in the US.
If you can't wait until April, Barquero is available on blu-ray in Australia, and is fully compatible with US players (and looks great!). The price is about double that of what I am sure the US disc will cost.
2015 is already looking like a great blu-ray year!