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A year ago , Silicon Graphics introduced a model priced at $ 15,000 -- almost as cheap as mainstream workstations that do n't offer special graphics features .
 A year ago, Silicon Graphics, 15,000
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 A year ago, Silicon Graphics, 15,000