Shopping for parts in the surplus market will often turn up items that are not only (more) breadboard-compatible, but also cheaper.
There aren't many jacks of any sort that are breadboard-friendly. What I've been doing lately is putting breadboards on old Lego baseplates, and mounting parts like jacks and pots to Lego plates and brackets with soldered-on leads to connect them electrically. That gives me relatively sturdy mechanical connections, with flexible positioning and less use of breadboard space.