Yes - orders for North and South America are available via PayPal at http://www.quilix.com/pio. All other orders can be made via ModMyPi website at https://www.modmypi.com/shop/sd-cards-and-adaptors/raspberry-pi-micro-sd-card-adaptor.
I'm not sure - I'll contact Pimoroni and post their response.
UPDATE: I've had some exchanges with Pimoroni on the dimensions of the adapter and the case. We're thinking that it may be too snug of a fit without some modification. However, I have yet to confirm this with a case in-hand.
This adapter is designed specifically for use with the Raspberry Pi... if it did fit into anything else - it would be purely coincidental. If people send me devices that it does fit in - I'd be happy to publish the list.