Coincidence or discrimination?

Went to the shop today to find a pair of sneakers for use on the track day tomorrow. Strangely enough, i found myself in a deja-vu. I can't seem to find one that fits me. The strange thing is, they have sizes for smaller feet (up to 9 or 10) and they have big ones (13 upwards), but the never seem to have for the middle bit (11&12), the size i'm using.
For heavens sake, is this a coincide AGAIN or is it a matter of discrimination against us lot with the 'somewhere in the middle' sized feet?
Guess it's time to find out...