You need the services of a gunsmith.
25-65 or so
best let a gunsmith dissemble & clean it
Try gunpartscorp.com- and are you sure that its not a J-22?
About $75, more or less, depending on the condition.
Follow the instructions in the owner's manaul. If you don't have one, call Glock.
No published sn data
How much is a car? Depends on the car, and on the pistol. A Jennings J-22 might sell for $75. A Ruger Mark II heavy barreled target pistol- $375. An Olympic grade Hammerli- $1,075.
$30 - $80. Low quality firearms intended to be low cost.
Check with your local gunshop- they may be able to order one. You can also check gunpartscorp website. Unfortunately, expect the magazine to cost about half the value of the pistol.
"AE" prefix indicates 1968 Value depends upon condition; fair - $50 to Excellent $165
25-100 USD or so depending on specifics