To further clarify why most stores don't do "order in and try- no obligation" for strange sizes. Most bikes from manufacturers are shipped partially or not at all asembled. It normally takes a mechanic about 1 hour to assemble the bike (wrapping handlebar tape, running cables, fitting parts together) so that is a cost to them.

Once out of the box- cannot be returned to the warehouse, even if they manage to get it back in the box! So the store or the company's rep will have to find another store to take the bike off the orginal store's hands if they cannot find anyone else to buy it- and to keep costs down that means it cannot really be shipped to the other side of the country- probably just within the rep's territory (of course extreme circumstances will mean a bike MIGHT travel across country for a determined buyer).

There could be more flexibilty in stores that are "sole brand". Eg concept stores for one brand of bike only. That means they are considered the "elite", top rung store and probably have special priveliges that other multi-brand stores will not. But of course this is really only for big brands. Small brands are less likely to take the "hit" of an unsold bike.

Hope this clarifies things a bit more for everyone.