It has nothing to do with their regular price, it is 40% and 25% of list price. Generally, they are 10% - 15% off list which is more expensive than most Judaica stores which are 15% - 25% off list. So this sale is better than the average Judaica store normal pricing and a probably a little better, or at least equal to, even most places sales. Usually, only time you will see a sale more than 40% off list of anything is a close-out or going out of business sale (or a real loss leader).
I will tell you that at judaicaplace.com, 3 pairs of tzizis were significantly cheaper (% wise( than at Eichlers, but I can't tell you if the same brand. At judaicaplace it is keter brand.