Printing 3x4 photos

Good day, kind folk at preview message boards.

I have recently become aware of a dillema which has shaken the very foundation of my photographic prowess.

Be it from snapfish.com, walmart, walgreens or CVS, whenever I want to print a photo, I can't print in individual aspect ratios. I shoot in a 3x4 aspect ratio 90% of the time, and the only options available are 4x6 (2x3). When I print, I often have to make an awkward crop that, while not that noticeable to others, undermines my entire compositional effort.

Have any of you figured out how to order high quality prints that respect the aspect ratio with which your given photos were taken?

Much thanks,