The Saskatchewan REALTORS Association tracks sales citywide rather than street by street, so a general answer about which neighbourhood is cheapest is really a statement about typical lot size and building age in that area, not a guarantee about any one house. Two homes on the same block can land on opposite sides of the benchmark depending on their condition.
Older neighbourhoods closer to the river and downtown carry character housing stock from decades ago, which usually means a smaller footprint, an unfinished basement or original windows, all of which pull the asking price down relative to a newer build in a developing suburb with a double garage and central air already in.
The honest way to find your actual cheapest option is to compare specific listings against recent comparable sales, not neighbourhood reputation. Get your hand-reviewed valuation from Joel Dyck.