The phrase "to come by" means to obtain or acquire something, often through effort or searching. It can also mean to happen upon something unexpectedly or naturally.
Thanks for coming by for a peek at what's going on around my house! (theinspiredroom.net)
The latter can be hard to come by in today's world of huge, hardware laden bags, so more often than not, I shop for styles from the 1930s - 1980s. (chronicallyvintage.com)