<$600k for me, and that would feel more like luxury than poverty.
Our current household expenses for a family of four (two adults, two kids aged 8/9) are ~$2,200/mo, which is not so different, and that's with a pretty large (for us) mortgage (not to mention all the normal home maintenance that ownership entails vs renting).
If I wanted to live on less, it would look like one car (efficient, but likely driven like a clown car; e.g., an older used Prius driven 400-500mi/mo), bikes for everyone. Renting (or owning, if that's cheaper) a ~1,200sf 2br house/apartment, not eating out (but cooking delicious food at home), road trip every year for a couple/three weeks, having a reasonably large garden (likely plus chickens), going on lots of largely free adventures in a largely rural setting.
Budget would break down something like:
800 Rent
250 utilities
250 Food
100 gas/ins/repair
150 household misc
40 phone
40 internet
50 clothes/toiletries/medicine
40 birthday/school supplies
___
1720 Total/month
It'd be even less if we could find cheaper rent, or a place with utilities included. Plus, it seems that there is an irregular but constant stream of "found money" from various random sources (bank bonuses, credit card bonuses, selling stuff on craigslist, kids earning their own pocket money, selling chicken eggs to neighbours, etc.)