Single-stage dies are not practical.
You can find a used press, as FITASC mentioned, for fairly cheap. Dies cost the same, or more, and are only suitable for brass cases. (CH-4D offers them. RCBS used to - might still. Lee made them for a short time, so finding a used set might be possible.) Exception: A company called "WTS" made dies for plastic hulls several years ago, but they are no longer in production and were made in
very limited quantities.
Unless you want to convert to brass shells for all reloads, it makes far more sense and costs less to just find a used .410 shot shell press. -- One capable of resizing bases would be good; but if you're only using one shotgun, it's not a big deal.
Space isn't much of a consideration, either (I bring it up, because I see a lot of complaints about space requirements when it comes to shot shell presses). A MEC Jr, for example, doesn't need to be mounted to a bench all the time, and only takes up about as much room as a half-decent camera tripod when stored. I've got an MEC 625N(?) [12 ga] and a Lee Load-All [12 ga], plus a 20 ga conversion, sitting on an out-of-the-way shelf, and I often forget that they're even there. Sometimes, I forget that I even own them.
If you have room to stick a padded rifle case in the corner, or a bag of wads on a shelf, you've got room for a shot shell press.
Yes, the stupid-cheap Lee Load-All works. It's one of the few Lee tools that I have found to be good enough to keep around. Unfortunately, it was never made in .410, because half of the 'die carrier' would have required metal parts instead of Lee's signature plastic.
Were do you find brass 410 shotgun shells?
On my shelves. Oh, you mean to
buy...?
The usual places: MidwayUSA, Brownell's, Midsouth, Natchez, etc.
MagTech (CBC) is the main player (due to price and availability), but other companies offer them as well.