I found them in a 2-pack in the travel section of our Wal-Mart so I didn't have to buy an entrire box of them
you also might try googling sample products. It's been a while, but I got a sample of just 1 sheet that I put aside to travel with and haven't used it yet, and since I only plan on doing 1 load of laundry, it'll work perfect!
I have a few things on my packing list that isn't on yours. May not apply to everyone, but I figured I'd post in case it could help someone
bobby pins
jewelry
tampons/feminine products (you just never know!)
blow dryer- I've read that the resorts have one, but they aren't that great?
straightener
mister fan
safety pins
bug spray
aloe
batteries (our camera takes AA)
ipod/fm transmitter (for the car ride)
portable dvd player/dvds (for the car ride)
beach bag (for pool trips... I have a small backpack I got from American Eagle that packs up really small)
allergy meds
spray neosporin (for scrapped up knees, it's small and portable and you don't have to get your fingers all messy!)
wet ones (the wipes)
Tide to go pen
reusable water bottle
small bills (for tips and tolls)
small towel (to wipe down seats after rain)
scissors
power strip
glow sticks (so you don't have to buy the overpriced ones!)
plastic fork/spoon/knife (for leftovers in the room)
plastic drink lids (put a popsicle stick through the straw hole and it'll catch the drips!)
for those w/ young kids-
diapers
wipes
bedtime supplies- stuffed animals/blankies
nightlight
princess dresses for CRT
detangler spray
sippy cups
dish soap (to clean sippy cups... or refillable resort mugs)
floaties/water wings
medicine dropper (for liquid medicines)
I know that's a lot. We drive so we don't have to pack light

Some of that stuff is important though
