I've been studying low carb diets for years, but 20 days ago I finally decided to definitely change my eating habits and now I'm full paleo.
At first, in order to not feel overwhelmed, I ignored omega 3 to omega 6 ratios and postponed my decision to buy grass fed beef. Two days ago I decided it was time to make these adjustments and went looking for grass fed beef. To my surprise I found out that pretty much all the red meat I eat is already grass fed, since 80% of Brazil's cattle (I'm Brazilian)is grass fed, in the state where I live it's pretty much 100%.
They still get tons of antibiotics and hormones but it's better than grain fed antibiotics ridden beef.
So, if you can't find/afford grass fed beef one option is to look for meat imported from Brazil, since there is a great chance that this meat will be grass fed.
I hope that helps someone.