Worcester, not wochester. Kuchnie Swiata in Magnolia Park should stock it, however if the Rynek is nearer for you, have a look in the Kuchnia Swiata branch in Renoma first, just in case.
Kuchnia Swiata should stock it, but they will charge a lot for it. A cheaper bet will be Marks & Spencer (in Arkady Wroclawskie at ul. Powstańców Śląskich 2-4, apparently).