How to get new locks rekeyed to use the same key

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Paying a locksmith over $500 for professional parts, rekeying, and installation
2. 2
   Buying DIY rekeying kits for around $20 to change lock configurations manually using online tutorials
3. 3
   Ordering all new locks directly from a manufacturer that ships them pre-keyed alike
4. 4
   Hiring a local handyman to handle the physical door boring and installation separately from taking cylinders to a locksmith
5. 5
   buying self-rekeying lock sets like Kwikset Smartkey
6. 6
   searching through store stock boxes to find multiple locks that are already keyed alike using serial numbers
7. 7
   hiring a local locksmith to come to the home

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.