Our pricing is based on a wide range of factors, such as the source of supply, the quantity purchased, the supplier, etc. The case you have observed also involves a price difference due to these factors. The case you observed is also a price difference due to these factors. We are always looking for the best prices so that our customers can benefit from the most attractive offers. As soon as a quantity is sold out, we have to go back to other suppliers. This creates natural price differences.