I like Katherine Martinko of Tree Hugger. She’s done it again for me, with an essay about how to live on very little money.
My wife and I have been living 17 of her 20 recommendations. However, our motivation has not been to reduce our costs per se, but to cause minimal damage to our world. Every dollar you spend, on just about anything, supports the multinationals who wreck everything. The enemy is the economy, and by spending less, we can reduce our contribution to it.
Also, Katherine doesn’t mention a major side-benefit: letting go of wanting is the route to contentment. All the major religions say so.
All this is explained in How to change the world.