Re: bow thruster
For a boat that size I'd only consider one if I had a single inboard engine and my rudder was too small.
If you have an I/O then docking is relatively easy, just takes practice. If you have twin engines of any kind, you already have more maneuverability than the bow thruster would give you anyway.
If you must have one, the only ones that will fit are going to be the smallest electric models, and new they'll cost several times what your bayliner is worth.
If you're looking for a redneck solution, you could glass a tunnel into your hull just aft of the point where your bow enters the water and put a trolling motor size engine in there. You'd have to seal the wires and any penetrations of the hull of course, and the tunnel would probably cost you some performance.
What exactly are you looking to do? Dock easily, steer in hard current, ???
Erik