I concur with ladies earlier in this thread who've mentioned "not settling" (this is something that first resonated to me when I was re-evaluating my last serious relationship - we were together 4+ years, and I was settling for someone when I deserved more). It's actually a philosophy I take with me to examine more than just handbags and my wardrobe. That conversation is off-topic, but at any rate, it's been a useful metric for what and who I decide to keep in my life.
I also have taken to gifting experiences rather than material things, if they seem right for the recipient. For myself, I typically would prefer to receive no gifts (for a birthday, Christmas, etc.) in favor of folks arranging for a coffee date with me, or going window-shopping together, or coming to a food/wine/experience outing, and so on. I value the quality time together way more than, say, a new book or a new trinket (even if I like the new book or trinket). It also helps to reduce clutter! I have such a hard time getting rid of or re-gifting things that were given to me out of love/friendship.
To go back on topic, though - I have never named it but the 30-day delayed gratification list is something I've tried very hard to do with clothing purchases. This is definitely something I should create for my handbag wishlist as well!