ArtValue.ca has 2 auction art sale records for their paper drawing results, with prices in the range of C$250 to C$500.
batik on paper
Dimensions - 35.56 cms x 50.8 cms (14 ins x 20 ins)
Lot for sale by Saskatchewan NAC Auction House, Regina
Sat, Nov 5, 2016
Estimate $500 - $700
Sold for CAD $300
Audrey Piper was born in London, England in 1925. She studied at the St. Albans School of Art (Hertfordshire, England) and King's College, University of London. Piper emigrated to Canada in 1963 and continued her studies through art classes offered at the Mendel Gallery (Saskatoon) and the University of Saskatchewan.