That's not surprising, as retailers won't get many* of these limited edition models.
Add to that the very reasonable price and the fact that all options and the logic analyzer are or were included...
A glimmer of hope for the others:
Rigol is unlikely to have used its own hardware for the MHO98, meaning that the 1 GHz can probably be hacked on the normal models, as can the memory.
But then you don't have that “beautiful” look....

*) MHO98, limited to 1998 pieces worldwide - 98, 1998 : Year of establishment of Rigol