With the recent Savage Worlds 20th Anniversary Celebration KS what would I recommend for Deadlands? First off these are all DriveThruRPG PDFs even though Pinnacle has a capable PDF store. DTRPG is watermarked for Deadlands but I like the store better and getting archived/updated PDFs is a better experience than the Pinnacle store.

I'm going to the previous edition of Deadlands, the second edition Deadlands Reloaded. The current third edition has some nice campaigns out but the timeline moves forward and I recommend running the epic four campaigns, each versus one of the Horsemen of the Apocalypse.

First you need rules, the core Savage Worlds plus two core books for Deadlands Reloaded. Pinnacle is good about keeping core books low priced so even though it's three books in total it's like one big RPG core rules book.

Savage Worlds Deluxe ($10 PDF)
Deadlands Reloaded: Player's Guide ($10 PDF)
Deadlands Reloaded: Marshal's Handbook ($10 PDF)

Each of the campaigns is in plot point format. At base is a sandbox setting with lots of places and short adventures associated with them. Then there is the plot which is a series of medium-length adventures that can be introduced as appropriate.

Deadlands Reloaded: The Flood ($15 PDF)
Deadlands Reloaded: The Last Sons ($15 PDF)
Deadlands Reloaded: Stone and a Hard Place ($15 PDF)
Deadlands Reloaded: Good Intentions ($15 PDF)

With $10 left I'm not sure what to buy, guess I'll go with

Deadlands Reloaded: Grim Prairie Trails ($10 PDF) - this has 19 threats, each with an included short adventure so you can sprinkle something different while playing the above campaigns.

For $100 that's several years of gaming in the Weird West.