I was like that when I wanted to buy
Hatchie's Sugar & Spice EP from the Hatchie website when it was first released. I was aghast to find at the very end of the transaction that the $10 CD had a shipping cost of $8.50. (Postage wasn't mentioned at any other time during the purchasing procedure.) I backed out of that transaction quick smart pronto. (It took an email to the seller to cancel the sale, but they were understanding, and cancelled it, so all's well that ends well.)
I don't mind paying a couple of dollars for postage (it's usually only a PostPak for a CD to go interstate), but when it's almost the cost of the CD... well, that just freaks me out, man.
I was relieved to see it available a little while later
on eBay for $9, with free shipping.