I totally know what you mean. I did the opposite today. I went out, 3 days before pay day (so am skint) fully intending to just have a wander around, and came home kitted out with my wedding jewellry
Things like that always work best if you are not looking for it. Go into town with no cash, and no time, and you will be surprised how much stuff you can find that is perfect!
Seriously though, I hope you find everything you need soon.
Best,
Catherine