u/mathdude3

I was looking to buy a set from Bricklink and I tried using the "Instant Checkout Only" checkbox on the item page, but upon trying to check out, lots of the stores that come up still require me to wait for an invoice to find out the final shipping cost. Is this a glitch? I thought instant checkout was supposed to include automatic shipping cost calculations. Is there another way to filter out stores that do manual invoicing?