I have the Sears book on Omega 3's.
An excellent source of Omega 3's (DHA and EPA) is available from most SuperWal-Marts. Look in the egg section for "Christopher Eggs".
Each egg has 600 mg of DHA and EPA. That is the same as two standard fish oil concentrate pills.
It is, by far, the highest non-fish source of the converted Omega 3's I've ever seen (plant sources are ALA and converted at 10-15% efficiency to DHA and EPA).
http://christophereggs.com/Christopher eggs sound perfect. However, I live on an island far from any WalMart. I do have a local grocer who stocks specialty and super-healthy items and they might be willing to order them. I find all kinds of terrific stuff there from all over the world.