| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in May-2007 |
| Concise BOEING 28 N Circular Slide Rule | $64.00 | 06-May-2007 | 1 |
| Sama & Etani Concise model 600 circular slide | $52.55 | 09-May-2007 | 7 |
| Concise No. 300 Circular Slide Rule | $47.00 | 05-May-2007 | 14 |
| Concise Circular Slide Rule No 380 Japan draft | $45.44 | 31-May-2007 | 6 |
| E28 Concise Circular Slide Rule 600-ST Round 1 | $36.00 | 09-May-2007 | 6 |
| Concise Circular Slide Rule No. 28 N Japan Sin | $20.00 | 02-May-2007 | 3 |
| "CONCISE CIRCULAR Slide Rule # 27 W/ CASE, MAN | $15.19 | 31-May-2007 | 2 |
| NEW CONCISE No. 28 CIRCULAR SLIDE RULE STILL W | $13.27 | 04-May-2007 | 5 |
| OLD CONCISE CIRCULAR MONSANTO SLIDE RULE. TAKE | $11.19 | 07-May-2007 | 3 |
| Circular Concise Slide Rule No. 260 w/ Case | $9.99 | 24-May-2007 | 1 |
| VINTAGE CONCISE CIRCULAR SLIDE RULE w/case MAD | $3.28 | 08-May-2007 | 2 |