I did see where Palmetto state currently has Valkyrie 60 gr. Federal V-max in stock today. That won't get you a rifle or an upper, but either without bullets is just a club.
If you have an AR15 your best bet might be to build one. I just bought a 24 inch faxon barrel from optics planet for 339. You can get the bolt head from maxim firearms for 75. All you would need is a magazine.