If you can offer these products at these prices for one day a year then you can offer them for the other 364 as well.
The fact that you do not do so shows that either:
a) you are ripping us off for the rest of the year
or
b) there is so little demand for your product that you have to resort to desperate price gouging to push product that frankly we don’t need.
And if we don’t need it then it’s not cheap, at any price.