OLiS
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OLiS (Oficjalna Lista Sprzedaży; English: Official Retail Sales Chart) is the official list of the highest selling music albums in Poland. The list exists since October 23, 2000 and is provided by ZPAV.
This is a list of best selling music albums in the Polish media market, involving 50 matches. This overview is based on data from 233 points of sale: 227 stores of the largest retail chains in Poland: EMPiK (121 stores), Real (53 stores), Media Markt (38 stores) and Saturn (15 stores), two of the largest Polish internet stores: Merlin.pl, Rockserwis.pl and 4 retail stores. Pentor Institute collects and compiles the information about selling.