I guess all luxury items will be hard to come by so it is down to what you class as your luxury items.
Think about what you would miss the most, fags, beer, coffee, soft toilet paper, etc. and then stock up on those things but not before you have stocked up on the stuff that will keep you alive.
Make a note of everything you use in a 48 hour period, you might be surprised of what you have forgotten about.
In the first half an hour of getting out of bed you are likely to use toilet roll, toothpaste, soap, razor, (women's things), tea, coffee, sugar, milk, bread, butter, cereal, etc.
Some women might class make up as a necessity, actually make that MOST women.
Things that women only use once a month would definately be classed as an essential but they might not think about them when it comes to prepping. I bought some pads in ASDA last week for 14p. They are great for putting on wounds because of their absorbancy, throw a bit of duck tape round it and Bob is your auntie's live in lover. And at 14p they are as cheep as chips.
Just have a good think at what would be a pain if you didn't have and couldn't get hold of. I am a bit anal (no pun intended) when it comes to loo roll. The best value for money one I have come across is called NICKY and 18 rolls will set you back about £4. I have tried all sorts and most have been way too thin or over priced. I have well over 100 rolls stashed away and buy 18 rolls every fortnight. I do not use anything like that so my stash is growing.
I watched an episode of Supernatural where Dean Winchester gets thrown into the future. Society has broken down due a virus and some guy tells him that when he goes back to his own time, "Stock up on soft loo roll, you can't have enough soft loo roll, you'll thank me for it." Absolute classic.
Be lucky (and sanitised)