Comparing table saw motors with same hp and different amperage
In the vast majority of 120V-land, this is an easy problem to solve. Way easier than the $543+tax+shipping a 51-pound motor that will make your saw underpowered. 

Many circuits with the familiar receptacle are actually on 20A circuits

Because there's an exception in Code that allows the familiar NEMA 5-15 recep to be used on 20A circuits (as long as there are 2 or more sockets in the circuit).  The point of this rule is so the builder can just use the same recep everywhere. 

If the breaker is 20A and the cable is 12 AWG copper, then you absolutely can just change it to a NEMA 5-20 20A receptacle.  And, it's backwards compatible with NEMA 5-15, so your old stuff will still plug in. 



Changing the receptacle is such a simple and straightforward job (well, mostly) that inspectors exempt it from the usual rules about pulling permits, tenants not being allowed to do it in rental properties, etc. You still need landlord permission. 

A new dedicated circuit is fairly cheap to put in

A new circuit to serve any of the above-pictured receps can be run for about $40 in materials, + labor.  $550 is a lot of labor.  In fact, if you have any notion to do this with 240V circuits, now's the time before your state enacts NEC 2020, which will require a $80 GFCI breaker on 240V circuits.