I don't approve of looking for manufacturers to produce, because the market is depressed at present. No matter how good the product is, others dare not take over the production. On the contrary, negotiation wastes a lot of your time, which seems to have no investment risk, but ineffective efforts are actually a loss-making business, because you can devote your negotiation time and energy to working for others to earn wages. Although the investment will cost you a certain amount of money, you will have a bright future if you get through this.