When buying Apple Bluetooth headsets, here are some suggestions to help you find the cheapest purchase channel:

1. Official website: Apple's official website is the official channel for purchasing Apple products. If you can't find the product you need on the official website, you can also purchase it through the Apple Store app. Generally, the prices on the official website are the most transparent, but there may not be discounts and offers available through other sales channels.

2. Large retailers: Some large electronics retailers, such as Best Buy, Walmart, and Target, also sell Apple Bluetooth headsets. These retailers usually offer various promotions and may have more favorable prices. When purchasing from these retailers, please make sure that the selected retailer provides high-quality customer service and after-sales support.

3. Online stores: Amazon, eBay, and other online stores also sell Apple Bluetooth headsets. These stores usually offer a variety of prices and offers and may have cheaper prices. When purchasing, make sure to buy from reliable third-party sellers and pay attention to other users' reviews to understand the quality of the goods.

4. Holiday promotions and coupons: During holiday promotions, such as Black Friday, Cyber ​​Monday, and Christmas, Apple products usually have promotions. In addition, you can also look for coupons on websites and apps to further reduce the cost of purchase.

5. Second-hand market: If you don't mind buying second-hand Apple Bluetooth headphones, you can consider looking on eBay or other second-hand markets. Please note that buying second-hand goods may involve higher risks, such as purchasing defective products or not being able to get after-sales support.

Please note that when purchasing Apple products, please make sure you buy from official or reliable third-party channels. At the same time, compare prices and promotions of different sales channels according to your needs and budget to find the most suitable purchase method.