I think this is a wonderful thing to do for one's self.

I can tend to forget or feel bad for getting "me" something (like do I deserve anything?). My S/O has been a great person to remind me to "not forget about you Beauflow".... and that it is ok.

buying jeans can make me happy (no really, some times clothes if I have not bought any new clothes in a while can really lift my spirits).
Always Arts and Craft supplies, yarn, and then doing the projects can make so happy... some times electronics but I am hard on myself with electronics due to price.
I remember one time, I was at the forbidden Walmart, but they had $5 movies, and I got Horton hears a Who.... that really lifted my spirits for like a week

the only times this has not made me feel great, is if i have bought something when miss configuration what I can spend- which is rare but the effects of beating myself up about it can last for a while.

Some times just going to the dollar store can lift my spirits- I think that is mainly due to I get a lot of things for the home but the bill is cheap.....but I am odd too