Is Testors Liquid Cement being discontinued? I wasn't aware of that.
As mentioned, MEK is an industrial solvent, and it is/was readily available in large (quart) containers in most hardware stores in the paint thinners sections. MUch cheaper than little Testors bottles. However due to the stricter environmental laws (especially in the Western USA), MEK is becoming hard to find, and is being replaced by 'MEK substitute" which is nothing like MEK when it comes to using it as plastic cement. Here in Northeast USA, I can still finid MEK in hardware stores. But the can of MEK I own will likely last me for my lifetime.
Some lacquer thinners actually contain MEK in them. As for the smell, we all have different preferences as to what smells bad. MEK smell is usually less strong than an average lacquer thinner. Keep in mind that every brand of lacquer thinner has slightly different formulation (and odor level). I find some brands stinkier than others. Being in the hobby for decades, I even discovered that even the same brand of lacquer thinner can change formula. I used to prefer SCL brand, but few years ago it changed formula, now smelling worse than the older stuff.