The purchase agreement itself is also negotiable territory, and it is worth having a lawyer, licensed through the Law Society, review it rather than accepting the builder's standard form as fixed, since deposit terms and possession delays are exactly the kind of clause a competent lawyer catches before you sign, not after. Budget legal fees of $800 to $1,500 for that review, the same range as on a resale purchase.
Agent commission is negotiable too, and in Saskatchewan it is often tiered, a higher rate on the first portion of the price and a lower rate on the balance, rather than one flat percentage; that structure applies whether the home is new construction or resale.
None of this gets negotiated well after you have already fallen in love with the show home, so raise it early. Get your hand-reviewed valuation from Joel Dyck.