Well you must be lucky. In canada you have to order it. Even 8mm Mauser or 7x57 can be a pain to find and it is three times the price of 308,30-06-270 etc.

And I wish people would loose the metric designations for most Mauser cartridges. They are actually whitworth sizes, as are the actions.

9.3 is .366 or "R"
.275 is "P"

All of these calibers predate the frigging conversion to metric by decades.

Rigby had this figured out, hence the 275 rigby.