Here's your issue:

1) If you find any barrels for sale, they will be over $1K and closer to $2.5K from a dealer
2) The S0-series guns are not machined made and the new barrels will require fitting from someone who knows what they are doing. Expect to $250 to $500 for this
3) If you trade your barrels, some people will wonder why your gun barrels don't match the serial number on the receiver. Expect to get less when you want to resale.

Why do you need to go through this expense for 1.5" of barrels? The beretta barrels are usually marked on the left side with their weight in Kg. This weight can very. 30" barrels are not out of favor. So is it weight or barrel length?

Since you are in MA, you may want to visit and talk with Rich Cole in ME.

You have a very good barrel length by today's standards and the cost to change may be more than the gun is worth.