No Eric, Home Depot doesnt carry slip couplings. Belive me, I needed one desperately one night and the local HD that was open 24/7 couldnt help me out. In fact, they didnt know what one was.....hmmmm....whats that tell you? lol
Anyway, any of your local plumbing supply houses should have slip couplings. You're right, they have no ridge/stop in them and will slide completely over the pipe. If you use them, be sure to mark the pipe so that when you slide the coupling over the two ends you get it centered. With slip couplings you have to work fast.....mess up and you'll be cutting more pipe out to fix what you messed up.
There really isnt anything wrong with banded couplings at all. In fact, in thinking your situation over as I'm writing this post, I'm leaning more towards recommending that you use them instead of the slip couplings. The reasoning is that they allow for more of a "fudge factor". If it isnt quite right you can always loosend the band to make adjustments. Not to call your plumbing skills into question, but they would be a bit easier to use for a DIYer and here at least they are approved fittings.
Good luck and keep us updated on your progress.