Walmart offers the Rain-X Expert Fit Beam Wiper Blade in various sizes from $6.23. Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with our mention from a week ago and up to $10 less than you'd expect to pay for any size elsewhere, outside of the mention below. They come in select sizes from B16-1 to B26-2.
Of note, Amazon matches prices on select sizes, although many are low in stock and select sizes require a $25 minimum purchase to order.