Here is an article summarizing research on the nutrition benefits of grass feed vs. grain feed beef http://www.bulletproofexec.com/grass-fed-meat-part-1/
In what appears to have been a carefully run study, under the best circumstances, grass-fed beef provides a tiny fraction of the fatty acid benefits of fish.
In other words: even if grass-fed beef has a better fatty acid profile, "better than corn-fed beef" still doesn't mean "good source of healthful fatty acids"; both grass-fed and corn-fed are poor sources. If you believe you need a better fatty acid profile in your diet, take fish oil tablets or eat fish.
Which is unsurprising, because mammals suck at making omega-3s, and plants are a bad source of healthful omega-3s.
Let's not get too excited.
If you have a freezer, you store a 2 month supply for less than 2 months of softgels.