With the future of the world increasingly uncertain, a sturdy survival bunker suddenly seems like a good investment. No longer reserved for just the super-rich, there are plenty of budget-friendly options out there, whether you're looking to stockpile for a potential natural disaster or have a secure hideaway to hand in the event of a global emergency. 

Click or scroll on to discover the best affordable bunkers for sale, from underground homes to modular designs and DIY shelter kits...