| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Jun-2007 |
| CONCISE CIRCULAR SLIDE RULE No.28 NORTHROP AVI | $45.43 | 27-Jun-2007 | 5 |
| Concise No.600 Slide Rule/Data Center - New | $34.00 | 10-Jun-2007 | 9 |
| S & E Concise Chemical Tables & Circular Slide | $33.78 | 30-Jun-2007 | 22 |
| NEW CONCISE No. 28 CIRCULAR SLIDE RULE STILL W | $26.00 | 04-Jun-2007 | 18 |
| CONCISE SCIENTIFIC TABLES AND CIRCULAR SLIDE R | $23.00 | 20-Jun-2007 | 8 |
| SIC / Concise Model 300-B Circular Slide Rule | $21.50 | 26-Jun-2007 | 6 |
| CONCISE MODEL 28 CIRCULAR SLIDE RULE | $19.45 | 05-Jun-2007 | 9 |
| Vintage Key Line Concise CIRCULAR Slide Rule N | $13.00 | 20-Jun-2007 | 3 |
| "2 Vintage Concise Slide Rules, GE and Lockhee | $11.50 | 13-Jun-2007 | 6 |