There's No Place Like Home (1) - S5.E5

Toby Noe wins a lottery of $5,000 and becomes a man of means. He buys the children a cartload of fireworks, for an annual celebration. Standish dupes Toby into losing all his money using cards and drink at the saloon. Everything comes to a head as the fireworks go off in the saloon. The Ingalls, Olesons, and Garveys get tired of the bustling city life during all this (Nels getting drunk and wins a whole pile of money), and they decide quickly to return to Walnut Grove. The Ingalls take Albert along with them.