When spouses disagree on price, a common resolution is getting an independent, hand-reviewed valuation both sides accept as a starting point, rather than each spouse anchoring to a number that happens to favour their side of the settlement.
If agreement still is not possible, either spouse can bring the disagreement to the Court of King's Bench, though that route takes longer and adds legal cost, typically $800 to $1,500 for a straightforward matter, compared to settling it directly.
A neutral, well-documented number tends to be the fastest way through this particular disagreement. Get your hand-reviewed valuation from Joel Dyck.