| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Dec-2004 |
| "Sama&Etani Concise Science Tables, Circular S | $41.90 | 01-Dec-2004 | 13 |
| Concise #270N circular slide rule w/case+inst | $41.00 | 10-Dec-2004 | 3 |
| Concise #28N circular slide rule w/case + inst | $29.75 | 31-Dec-2004 | 4 |
| Concise #28N circular slide rule w/case+instr | $29.00 | 10-Dec-2004 | 5 |
| Concise circular slide rule w/case + instr | $28.00 | 17-Dec-2004 | 7 |
| CONCISE CIRCULAR SLIDE RULE W/CASE AND INSTRUC | $26.00 | 21-Dec-2004 | 6 |
| Vintage CONCISE Circular Slide Rule w/Pamplet | $25.00 | 24-Dec-2004 | 1 |
| General Electric Concise Circular Slide Rule w | $21.61 | 30-Dec-2004 | 3 |
| CIRCULAR SLIDE RULES # 28 BY CONCISE | $20.51 | 07-Dec-2004 | 7 |
| Concise #28 circular slide rule w/case + instr | $19.99 | 24-Dec-2004 | 1 |
| Concise Circular Slide Rule and Conversion Tab | $9.99 | 08-Dec-2004 | 1 |
| CONCISE Circular Slide Rule & Conversion Table | $7.50 | 06-Dec-2004 | 5 |
| Concise #28N circular slide rule w/case+instr | $19.99 | 05-Dec-2004 | 0 |