gabumon - I haven't seen the Bronies shirt at my local Walmarts.
edit - I did finally find the shirt Saturday at the Target off 5600w and 2800S - and they had all the sizes. I went with the men's small, the medium just looked a bit boxy to me. btw - the ad shows the graphic tees on sale for $8 this week, so I had them adjust the price today.