Ali Express is a website/app with everything under the sun at crazily low prices. I think it's because everything comes from Asia, but if you don't mind waiting six weeks for a purchase to arrive, you can find some real bargains.
I've screenshotted some crackers I found, so you can see the price and what to search for to find it yourself.
They are all under £6, and most sellers offer free shipping.
I love big, colourful statement necklaces like all those, but I also love a quirky acrylic laser cut style necklace too.
Lastly, he doesn't fit in the under £6 category, but I had to include him. Tacky and magnificent.