You can buy multi-packs of knobs w/the same lock/key combinations. I’ve seen packages of 6 at Lowes. I would imagine you can purchase even larger packages on the internet.
I changed my locks myself when my ex-husband kept coming into the house when he knew I wasn’t home.
I did it myself in an hour or so with a screwdriver. But, I’m pretty good at taking stuff apart.
If you don’t want to hire a locksmith, do you have a neighbor or friend who would do it for you ? You can get the locks easily at Lowe’s or Home Depot. Maybe offer to buy dinner or pay them for their time. It really isn’t that difficult to do.
