Evening Yoga Props: What's Actually Worth Buying?

The basic mat question
Thickness matters more than brand for evening practice. A 6mm mat from a sporting goods store ($20-30) cushions your knees better than premium 3mm versions costing three times more. You're not jumping around in evening sequences, so grip isn't critical.
Do you need blocks?
Only if you can't reach the floor in forward folds. Hardcover books wrapped in a towel work identically. I used dictionaries for six months before buying foam blocks on sale for $8.
What about bolsters and blankets?
Your couch cushions and regular blankets serve the same purpose in restorative poses. A folded bath towel under your knees in child's pose feels identical to a $60 bolster.
Are straps necessary?
A old tie or belt does the same job for binding poses and hamstring stretches. If you buy one, wait for end-of-season sales at discount retailers—typically under $5.
What should you actually spend money on?
A decent mat and comfortable clothes you already own. Everything else can be household items. I've taught students who practice entirely with borrowed props and they progress just as well as those with full equipment sets.