Which company is good for primer synthesis? (in terms of price and quality)

Our laboratory uses Beijing Dingguo Changsheng Biology, and the reagents used for primer synthesis are all imported and original. It is said that they also passed the HEPD patent. This is not the most important thing, mainly because we use it really well and the price is reasonable. Once I thought there was something wrong with the primer, and then they helped me solve it. They can also help customers keep samples for free for half a year. It's really good. Our laboratory used to be in Shanghai, but now it has been transferred to their company. ....