This is from the original question that this was asked about being in a small community very far away (think Texas or Alaska and the distances between communities in that state) from any source of kosher food (especially meat). The OP asked if Hallal would be preferable to regular non-kosher meat. The OP also mentioned eating fish in the original question, which is why I mentioned getting kosher fish from a regular fish market.
As part of my answer, I point out that kosher food can be shipped anywhere in the United States (which was also specified in the original question).
The hallal is just as much neveilah as any kosher species meat slaughtered by any other non-kosher butcher and just as forbidden. As I explain in Why is meat only kosher if a Jew slaughters the animal?, even if a non-Jew slaughters under the supervision of Jew who makes sure that everything was done properly, the meat is still forbidden as neveilah.
Similarly, you would need to check on how to get kosher fish products from a general fish market. One way would be to get kosher fish (fins and scales) and use your onwn (kosher) knife for the clerk to scale and cut the fish.
There are national brands that have a hechsher that you can find in your local supermakets. There are national brands that you can order to be shipped to you if they are not in your local stores.
Google is your friend. I did a search on Texas ship kosher meat to home and got a number of links to different stores that will send it to you. Note that since I do not need to do this, I cannot verify the kashrus or quality of any of the stores that have these web sites. When you do a google, you would also get non-Kosher ads as well, so you need to double check who they are and what hechsher they have.
For example
AviGlatt.com
You don't have to live in an area where Aviglatt.com is
Aviglatt.com Offers home delivery to get the best food at the best prices to ANYONE ANY WHERE in the U.S.A
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New YorkKosherSteaks.com
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