Hi! This is the Market Economics Fairy! If people are buying your product faster than you can make it, it means your prices are currently set too low! There's no point in keeping the price low to stimulate demand when you can't yet increase your supply! Temporarily raise the price until you can gear up manufacturing! That way the people who need your product the
most can get it right away! And you can invest more in manufacturing to satisfy more future customers! This will lead to a lovely Pareto optimal outcome with everyone living happily ever after!
(I write this with some reluctance, because this product sounds very cool and useful and yet the prices are probably set too high for the nonprofit I work for - but the more you charge now, the sooner you can scale your volume and lower your prices later, right?)