has anyone here right before they went on to WDW, bought a ton of Disney gift cards at like Sam's or Costco.. for what I understand they do put them on sale.. recently a friend of ours bought a substantial amount of gift cards while we ran into them at Sam's. .they were leaving in a day or two and using the gift cards to pay for their trip.. it seems that the savings are about 7to 10 %...unless you have heard of more.. thoughts, opinions.. true stories appreciated..