When looking for a cheap weed pen, especially one designed for use with cannabis concentrates like wax or oil, there are several options to consider. Here are some recommendations based on the information provided:

1. Vapmor VGO: This is a highly effective cheap weed pen at a reasonable price, offering a 2ml vape juice tank and a 1500 mAH battery for lasting use. It's designed for portability and ease of use, making it a top choice for budget-conscious vapers .

2. Aspire Tigon: A little more expensive than the Vapmor VGO, the Aspire Tigon offers a 2400 mAH battery for extended use. Its compact size and durability make it another great option for those seeking a balance between cost and functionality .

3. Vaporesso Sky Solo: One of the cheapest vape pens on the market, the Vaporesso Sky Solo comes with a 1300 mAh battery and a stainless steel body for durability. Its compact size makes it easy to store and carry .

4. Innokin Endura T20-S: This cheap weed pen offers a 1500 mAh battery and a 2 ml juice capacity. It's a cost-effective choice for beginners or those who want a simple and reliable device .

5. SMOK Nord AIO: This budget vape pen is known for its performance and functionality. Made from heavy-duty stainless steel, it's designed to withstand wear and tear, and its small size makes it easy to carry .

6. Dr. Dabber Stella: For those looking for a more advanced option, the Dr. Dabber Stella offers features like Vortex Airflow and a Floating Vapor Chamber, with a 600mAh battery and three temperature options .

7. Yocan Evolve Plus V2: This is a portable and affordable option that's great for on-the-go use. It has a single-button control and a variable voltage vaporizer battery .

8. HoneyStick Elf: Known for its concealable design, the HoneyStick Elf is an auto draw vape that's extremely palm-sized with a concealed cartridge and on-demand hits .

When choosing a cheap weed pen, consider factors like battery life, ease of use, portability, and the specific type of material you plan to use with it. It's also important to ensure that the device is compatible with the type of concentrate you prefer. Always remember to use your vape pen responsibly and in accordance with local laws and regulations.