Commission, on the seller's side of the same transaction, is negotiable and often tiered, a higher rate on the first portion of the price and a lower rate on the balance, and Saskatchewan Real Estate Commission rules require that agreement to be in writing rather than assumed.
A home inspection, typically $400 to $600, is a service you choose and pay for directly, so shopping among a few qualified inspectors is reasonable, though the cheapest quote is not always the most thorough.
PST on mortgage insurance and the ISC fee are calculated by formula and are not open to negotiation, so the realistic room to save is in the professional fees you choose, not the government-set charges.
Get your hand-reviewed valuation from Joel Dyck.