Just a note on Costco stocks: not all Costco's stock the same items as its based on demand, so you may want to call and find out what your local Costco (to be) stocks and even then that still may change. Pain relievers are usually limited to Trade Memberships only, so don't count on even being able to purchase pain relievers from Costco.
As others have mentioned about half the items you're looking for just aren't sold in the UK, except from specialty import shops at extortionate rates. If its something heavy like Karo Syrup you may want to stock up before you move and if you have a friend or family member willing to send lighter goods over see if they'd be willing to do so for you (even if you pay them either from a US bank account or via Pay Pal etc). A side note, there was a recent thread about Karo Syrup I believe in reference to Pecan Pie - I know I and maybe someone else posted recipe's to make your own Karo Syrup substitute.
Stick deodorant isn't as widely sold in the UK as it is in the US: deodorants tend to primarily be roll on or spray, although a few still do stick, but they're harder to find. Again if you may want to stock up initially and see if someone will add it to a care package if it's something you know you can't live without. Also, Amazon.com tend to sell some toiletries, but you may need to check if they'll ship the item internationally plus weigh up how much the shipping will cost you...
Good luck!
