I've done that too. I just make sure they're on my wish list for the next sale (or the next time I feel like scrapping photos/events covered by a kit I forgot to buy).
I've actually started setting an alarm on my phone to remind myself to finish up a transaction the day before a sale ends. (Sometimes I want to double-check I have everything in my cart.) I used to email myself but lately I don't check my scrapping email as often so an alarm works better; I set it for a time when I'm usually not busy. Maybe that could help you?
BTW, DSD is coming up. SSD's sales never disappoint, so I bet you'll be able to pick those kits up soon! ETA<<<I must have been typing at the same time as Jacinda! Yay for DSD!
