The only way would be from someone selling it. In 2013 I paid 20 million bells for a complete set.
The price has dropped to 200K for the 7-11 set and 200K for the Welcome Amiibo 7-11 Set. That's a good deal. Hybrid Heaven Shopping in the Service section on this board are selling both sets for those prices.
2.3 billion bells Town Victoria Name Mcnugget
Town Lazytown/ Stitch Town Lolly/ Stitch 2 Town Reality/ Queenbee