In response to the 'walking into a pharmacy and getting darts on the east coast' question - there are certain places which never question it. I know there are several 'Eckerds drive through' pharmacies that never question my asking for 50 syringes...

Personally I use a 22x1 for glutes/quads/etc. I've just had to be careful when hitting my glutes to do it in a place with very little fat due to the size of the pin only being an inch...