The game doesn’t go on sale very often because it’s very fairly priced at $35 and I’ve gotten each DLC the day of release so idk how they do bundles. It may be a long wait if you’re hoping for a deep sale as I’ve never seen it drop more than 25% below retail price.

You get a lot of the core experience from the base game+mods. So don’t feel like you need to get DLC to start because there’s a learning curve on the game anyway. The community endearingly calls your first 1000 hours in the game “the tutorial.”