| Waldom | Eaton Electronics BK1/S506-2-R | 150 | 14220 | 1 | 150 @ $0.37, 750 @ $0.36, 1000 @ $0.34 |
| Waldom | Eaton Electronics S506-2-R | 24 | 765 | 1 | 24 @ $2.24 |
| Waldom | EATON ELECTRONICS BK1-S506-2-R | 1 | | 1 | |
 Digi-Key | 1878103 | 1 | 765 | 1 | 1 @ $6.18, 5 @ $5.97, 10 @ $5.75, 50 @ $4.48, 100 @ $3.73, 250 @ $3.62, 500 @ $3.09, 1000 @ $2.93 |
| us.rs-online.com | 74057166 | 1000 | | 1000 | 1000 @ $0.47 |
| us.rs-online.com | 74057186 | 5 | | 5 | 5 @ $3.08 |
| Crescent Electric Supply Co | 2099826 | 1 | | 1 | |
| Digi-Key | 1877161 | 1 | | 1 | |
| RS Delivers | 537-1341 | 1 | 135 | 1 | 1 @ $2.07, 5 @ $1.97, 10 @ $1.85, 50 @ $1.70 |
| Waldom | EATON BK1/S506-2-R | 1 | | 1 | 1 @ $0.36, 250 @ $0.34, 1000 @ $0.32 |
| Waldom | EATON S506-2-R | 1 | | 1 | 1 @ $2.47, 2 @ $2.35, 3 @ $2.29, 5 @ $2.22 |
 IBS Electronics | S506-2-R | 1 | | 1 | 1 @ $0.50 |
| sustainablesupply.com | C1177083 | 1 | -2 | 1 | 1 @ $19.33 |
| Waldom | EATON BK1-S506-2-R | 1 | 78 | 1 | 1 @ $0.05 |
| Digi-Key | 283-3308-ND | 1 | 1019 | 1 | 1 @ $0.83, 5 @ $0.80, 10 @ $0.78, 50 @ $0.65, 100 @ $0.54, 250 @ $0.49, 500 @ $0.42, 1000 @ $0.37, 5000 @ $0.33 |
| iodParts | S506-2-R | 1370 | 6770 | 1370 | 1370 @ $0.44, 2830 @ $0.42, 5845 @ $0.41 |
| Future Electronics | 5734017 | 1000 | | 1000 | 1000 @ $0.67, 2000 @ $0.48, 3000 @ $0.47, 4000 @ $0.47 |
| Future Electronics | 5028023 | 190 | | 190 | 190 @ $4.10, 25 @ $2.99, 50 @ $2.79, 125 @ $2.55, 250 @ $2.38 |