A great resource from GetEducated.com here listing the top 25 online programs in engineering. The listing of online programs in engineering includes the average cost as well.

1. North Carolina State University (NC) $5,280 (NC); $20,000 (Others)
2. California State University - Dominguez (CA) $5,500
3. Mississippi State University (MI) $6,848
4. South Dakota School Mines (SD) $7,680
5. Oklahoma State University (OK) $8,800 (OK); $13,600 (Others)
6. University of South Carolina (SC) $8,910 (SC); $16,650 (Others)
7. University of Toledo (OH) $9,097 (OH); $19,663 (Others)
8. University of Tennessee (TN) $9,060 (TN); $25,380 (Others)
9. State University of New York Binghamton (NY) $9,356 (NY); $14,367 (Others)
10. Eastern Michigan University (MI) $10,101
11. Boise State University (ID) $10,620 (ID); $13,140 (Others)
12. University of Delaware (DE) $10,530 (DE); $26,670 (Others)
13. Virginia Polytechnic Institute (VA) $10,313 (VA); $17,175 (Others)
14. California State University Long Beach (CA) $11,550
15. Capitol College (MD) $12,300
16. Kansas State University (KS) $13,000
17. University of Idaho (ID) $13,710
18. Iowa State University (IA) $14,100
19. Auburn University (AL) $15,000
19. University of Wisconsin Platteville (WI) $15,000
20. University of Illinois Chicago (IL) $15,840
21. University of Colorado Boulder (CO) $16,050
22. University of Massachusetts Amherst (MA) $16,500
23. Pennsylvania State University ((PA)) $16,830
24. Oregon State University (OR) $17,145
25. University of Missouri Rolla MO) $17,148 (MO); $34,631 (Others)