Disposable carts

The "single-use cartridges" you mentioned usually refer to two types of products on the market: one is an integrated single-use electronic cigarette, and the other is a pre-filled cartridge for a rechargeable device. The usage methods and costs of these two types of products are quite different. I have sorted them out for you. 
⚡ Type 1: Integrated Disposable Electronic Cigarettes (Disposable Vapes)
This product has the e-liquid and battery integrated into one unit, which cannot be separated. The entire unit is discarded after use. It emphasizes supreme convenience. 
Representative products: There are many products in the market that highlight high number of ports as their selling point, such as RAZ VUE 50K, Relx Ace 30000, STLTH LOOP MAX x ELFBAR, IGET ONE 12000, etc. 
Emerging trend: In order to be environmentally friendly and enhance the user experience, some products have begun to adopt detachable battery designs. For instance, the cartridge part of RAZ VUE 50K (containing a 420mAh battery) can be separated from the reusable power bank (900mAh). 
Price Reference: 
US market: Taking RAZ VUE 50K as an example, the equipment package costs approximately $19.99, while the individual cartridge purchase is about $12.99. 
Chinese market: The prices of disposable electronic cigarettes generally range from 100 yuan to 300 yuan. 
Australian market: At prices below $30, many excellent products can be found, such as Alibarbar Ingot 9000, IGET Bar Pro 10000, etc. 
Cost-performance analysis: Purchasing products with a higher number of outlets is usually more cost-effective. For instance, Bang King 50000 (50,000 outlets) has a cost per outlet as low as 0.0005 euros in the EU market. However, it should be noted that the stated number of outlets is the ideal value from the laboratory, and in actual use, it is usually discounted (about 80-90%). 
?? Type 2: Rechargeable electronic cigarette pod (prefilled cartridge)
This product is used in conjunction with a rechargeable electronic cigarette stick (main unit). The pod needs to be replaced after use, while the main unit can be reused. 
Representative brands and prices: 
RELX (Yueke): As a mainstream brand, the price of its cartridges is relatively high, approximately 50 yuan per piece (3 pieces cost about 150 yuan). 
Generic/Third-party Brands: There are numerous third-party cartridges available on the market that are compatible with mainstream devices, and they offer more competitive prices. For instance, the Zero 5th Generation cartridge (compatible with RELX fifth-generation devices) costs approximately 30 yuan per piece. Additionally, brands such as Feifu, Bixiong, and Songhe have "universal cartridges" that are renowned for their high性价比 and a wide range of flavor options. 
Long-term cost: Although a main unit needs to be purchased initially, subsequent only requires the replacement of cartridges. The average daily usage cost is usually lower than that of disposable products. 
⚠️ Important Reminder: Regarding Purchase Channels
In the Chinese mainland, the sale of electronic cigarettes is strictly regulated. 
Legal channels: According to regulations, electronic cigarette products must be traded through the unified national electronic cigarette trading management platform. Only enterprises holding a tobacco monopoly license can conduct transactions on this platform. 
Offline physical stores: Physical stores that hold a tobacco专卖 retail license are legitimate purchasing channels. 
Online channel risks: Currently, when directly searching for keywords such as "electronic cigarettes" on mainstream e-commerce platforms in the Chinese mainland (such as JD.com and Tmall), it may not be possible to directly find related products. Some products may be circulating through obscure names like "electronic spray" or non-public community channels. Be vigilant of these unofficial channels as their product quality and source cannot be guaranteed. 
?? Summary and Selection Suggestions
To facilitate your decision-making, here is a quick comparison: 
Features: Integrated disposable electronic cigarette, replaceable cartridge pre-filled with e-liquid
Usage: Integrated design, discard after use. The cartridge can be replaced, and the main unit can be reused.
Convenience: Extremely high. Just open the bag and smoke. No maintenance required. 
Initial cost: Low. Medium (requires purchasing the main unit)
Long-term cost: Higher, especially for heavy users. Lower. Daily cost is better.
Target audience: Occasional users, travelers, and those seeking novelty. Daily frequent users.
After reviewing these comparisons, which type do you currently prefer? If you have a specific model in mind or want to know about a certain brand's flavor, feel free to ask me anytime.