I eagerly bought DS loads of pants when he was 2 and hoping to potty train early. He didn't! He's now 3 fully trained and in larger size pants.
So now I have a stack of about 15-20 pairs of boys pants, M&S size 1.5-2 and 2-3 going spare.
It may be too odd, but if anyone wants a load to use if they are getting through a lot with training, or so you can just throw away poo incidents without feeling you need to save the pants, I'd be happy to post them out.