Local Grocery Stores
You can check your local grocery stores for a quarter of organic beef. There are sections in most major grocery stores these days that have organic products section. Know which kind of beef you like the most and get that. Mostly it will already be packaged.
Go to a Farm
There are some farms which raise the livestock the good old fashioned way and do not resort to supposedly modern yet unhealthy ways of boosting production. You can go to one of these farms and get your organic beef from there. Obviously you will need to go to a farm that has a shop as well since you only need a quarter and not the whole animal. Over here, there is good chance that you can get a piece cut as per your own liking as they are very forthcoming in these matters.
Check out the Lists
You can also buy organic beef from other outlets that you are not aware of. You can check the list of organic meat suppliers that is provided by your local food department. These outlets will have certified beef and you will not have to worry about the quality of the product.
You can also order online and the beef will be delivered to your doorstep. As always, make sure that the online store from which you are ordering is reliable and has a good reputation. Be careful when buying online as some of the claims that are made on the website can be false and it is good to check out the feedback before going ahead with the order.