Glossary entry (derived from question below)
English term or phrase:
buy one get one free (BOGO)
Spanish translation:
dos por el precio de uno
English term
Peru
Translator, traductor, traducteur
Native in: Spanish (Variants: Latin American, Peruvian) 
Works in: English to Spanish, French to Spanish, Italian to Spanish
buy one get one free (BOGO)
Non-PRO (1): Kirsten Larsen (X)
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Proposed translations
dos por el precio de uno
compre uno y llévese otro gratis
| agree |
Mónica Algazi
37 mins
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Gracias.
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| agree |
Jaime Oriard
: 2x1
1 hr
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Gracias.
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| agree |
Phoenix III
1 hr
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Gracias.
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Chile
Human-scale Globalization
Native in: English (Variant: British)
Works in: Spanish to English, French to English, English to Spanish, and 2 more.
yapa
It's even in the RAE:
http://dle.rae.es/?id=c9H0Dx7
2. f. Arg., Chile, Ec., Par., Perú y Ur. Añadidura, especialmente la que se da como propina o regalo.
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Note added at 2 hrs (2016-11-11 20:12:28 GMT)
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Actually, if the truth be told, it's usually "6 for 5", not "5 for 6".
Argentina
45 yrs' experience in most every field
Native in: Spanish (Variants: Rioplatense, Latin American, Puerto Rican, Dominican, Standard-Spain, Uruguayan, Bolivian, Argentine, US) 
Works in: English to Spanish, Spanish to English, Spanish, and 1 more.
2 x 1
Supermercado Dia - Ofertas, promociones y descuentos | Promocion ...
https://promocionofertas.com/tienda/supermercado-dia/
Supermercados Dia 2x1 en productos 11 de noviembre. Supermercados Dia te ofrece esta grandiosa promoción de 2×1 en productos seleccionados
2x1 para ver a Ana Belén y Victor Manuel con Club EL PAIS http://www.buscodescuentos.com.uy/
Mexico
Confianza, certeza, creatividad.
Native in: Spanish (Variant: Mexican)
Works in: English to Spanish, Italian to Spanish, French to Spanish, and 6 more.
pague uno y llévese dos
compre uno y llévese dos
Saludos cordiales.
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