I don't often shop, but when I do I go to the old folks thrift store. It's run by the elderly and the money is well spent.
I was in desperate need of a new computer table, the old one crashed (in a graceful manner thankfully since it carried all my hardware including our 42" secondary monitor). We found not only a nice sturdy table perfect for the space and my computer needs but also 4 fancy metal coasters.
For all this including home delivery I paid €45.