here is the list of PST exempt goods and products for BC:
https://www2.gov.bc.ca/gov/content/taxes/sales-taxes/pst/exemptionsIn some cases provincial sales tax (PST) doesn't need to be paid on purchases or leases. The following exemptions are available to everyone and don't require any documentation:
Food for human consumption (e.g. basic groceries and prepared food such as restaurant meals)
Books, newspapers and magazines
Children-sized clothing
Bicycles
Prescription medications and household medical aids such as cough syrup and pain medications
Other exemptions are available in certain circumstances and may require documentation. These include exemptions for:
Health and medical products, and equipment for persons with disabilities (PDF, 606KB)
Adult-sized clothing and footwear for kids under 15 years of age (PDF, 279KB)
School supplies for students (PDF, 292KB)
Safety equipment and protective clothing (PDF, 317KB)
Farming, fertilizers, fishing and aquaculture (PDF, 606KB)
Purchases by First Nations individuals and bands on reserve land (PDF, 390KB)
Goods purchased for resale or lease (PDF, 368KB)
Used zero-emission vehicles (PDF, 398KB)
a good reason not to exempt used goods is to not distort or bias the market. Pretty standard advice from economists I figure!