The sales lately have been all about Modern Horizons 2.
The reason for this is the speculation on the print run.
The rumor mill is that this is a one and done print run. It is not clear whether this is true but in the last month the distributors and pundits are on both sides of the rumor. Lately more are getting into the camp that this is one and done.
If this is the case then the prices on this product are a potential "to the moon" product over time.