The cost of the barrel is more than the whole gun is worth retail.
My suggestion is to render it unrepairable.
If you wish to ignore my sugggestion, try www.e-gunparts.com
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)