How do I say 'I want to buy'?

The language of buying in Chinese tracks a gradient from browsing to commitment, and using the right word at the right stage matters for both social smoothness and price:

• 我想买 — I’m considering buying. Low commitment, appropriate for browsing. Vendors will engage but not offer their best price yet.
• 我要这个 — I’ll take this one. Medium commitment. You have chosen the item but may still be discussing price.
• 我要了 — I’ll take it (at this price). Deal done. This is the closing phrase.
• 买了 — Bought. Often said to yourself or your companion at the moment of decision. “I’m doing it.”

The bargaining sequence in practice: 这个多少钱 → 太贵了 → 便宜一点 → (counter-offer) → 行，我要了. Each phrase has its place in the script.

A useful psychological move: showing willingness to walk away. 那我再看看 (“then I’ll keep looking”) said without hostility often triggers the vendor’s best offer. They would rather close the deal at a lower price than lose the sale entirely.