There are very few razors for sale that are shave ready and under or around $30. If you shop around for honing it runs somewhere from $15 to $25 plus shipping. So for $30 you can ship a razor and have it honed, but that is without the razor. There are some cut rates brands out there from China that can be purchased for around $5 each if you buy it bulk. They will all need extra work. If you buy the hones and other item and learn to do it yourself you can fix the well known issues with the cheap razors and hone them. It will require some output of time and money. The math simply does not work. You will not be able to turn a profit with those numbers. The model will have to be changed before you can make a business case.