I just went to Mike's, no problem, no warning message
Went to Wooden Teddy Bear looked at FD UR #5 at gross pricing 12 x $2.80 - $33.60. WTB is a little confusing and you were looking at price per dozen they are $3.50 per doz. if you buy 1 - 11 doz $3.50 X 12 = $42
If you look below where you went to order per doz it will have same heading except it say "gross pricing" or something like that, that is where you will see $2.80 per doz pricing.
I think WTB could make there way of ordering somewhat less confusing, they could just copy Mike's Workshop method, they own it.
If you ask how I know this, I went through the same thing last time I ordered blades. Wanted to buy from WTB because I thought Mike's would probably be discontinued after a while. Figured the price as you did and wondered, why would anyone buy from WTB when I could get them from Mike's so much cheaper, and even more confusing why would WTB let Mike's be so much cheaper, when they own both sites? Then I went back to WTB's site to recheck the price and figured out how they do it on the WTB site the second time I was there.