I currently struggle to buy anything that would have a positive effect on my happiness. I got a motorcycle two years ago, and while I do pretty few miles, it provided quite some happiness (going on Saturday rides with a friend, general added feeling of "freedom" because of having a way to escape the city and also do short trips I usually would fret about which public transport to take or if it makes sense to use carsharing). Another thing that comes to mind is my Vacuum cleaner - I spent money on a cordless Dyson and I can clean my small flat in 15 minutes now (robot doesn't make sense due to the size).

I have the budget to buy some live improving stuff, but I don't see anything.