Thats because selling medical or lab equipment is like selling Popcorn and soda at a sports event. Markup is about 800%
You have no idea what it takes to get FDA approval to sell any medical item nor the legal liability you will be exposed to after it goes to market.
Yes, a piece of plastic tubing at home depot cost $1/foot but, if that same piece of plastic is FDA approved, it costs logarithmically more and every lawyer will destroy you if somehow it should somehow kink.