This is a shameless plug for my buddy who runs a home-based FFL and NFA business. I’ve bought three cans, and a SBS is in the works through him. He is a good friend and a fellow co-worker (we’re both Engineers), so yes, I’m biased 
He also does regular FFL transfers (form 4473) for $25. He has a website that talks you through the steps on how to get a can if it’s your first time. He also has a link to 199trust.com, which is offering to draw up your NFA gun trust for $79 (the lowest it’s been!)
He has distributors he works with to get the can you want. So if you’re an Alabama resident, give him a call and see what he can do for you. If you’re out of state, I think he can still work with you, but there’s obviously other laws/rules/regulations that applies to that.
I have and use my NFA trust for all my purchases, and he has the experience on how to use a trust or corporation when applying for your NFA item. I vouch for him personally, and if you have questions about him feel free to contact me if you like before calling him. He’s one of the good guys! His name is Scott, so give him a call, or take a look at his website: