| Waldom | Eaton Electronics BK/S501-1.25-R | 25 | | 1 | 11 @ $4.94, 25 @ $4.94, 100 @ $4.67 |
| us.rs-online.com | 71930799 | 100 | | 100 | 100 @ $5.28, 200 @ $5.17, 500 @ $5.01, 1000 @ $4.97 |
| Allied Electronics | 71930799 | 100 | | 100 | |
| Digi-Key | 1023891 | 1 | | 1 | 1 @ $7.41, 5 @ $7.14, 10 @ $6.88, 50 @ $5.29, 100 @ $4.50, 250 @ $4.23, 500 @ $3.70, 1000 @ $3.57, 5000 @ $3.31 |
| Waldom | EATON BK/S501-1.25-R | 1 | | 1 | 1 @ $3.87, 25 @ $3.69, 50 @ $3.60, 100 @ $3.48 |
 Onlinecomponents.com | BK/S501-1.25-R | 1 | | 1 | 1 @ $2.33, 10 @ $2.33, 100 @ $2.33, 1000 @ $2.33, 10000 @ $2.33 |
| Hotenda | H599722 | 1 | | 1 | |
| Digi-Key | BK/S501-1.25-R-ND | 100 | | 100 | 100 @ $1.28 |