Take a look at MABJ's "confused journey" tank journal. He put together a nice little 18x6x6 tank for just under $100 I think
Link: Confused journey of another nano
Thanks for the shoutout! LOL I was shocked to see my thread mentioned.
If you have materials around, you can do things very inexpensively. I chose even more expensive options to satisfy my desire for a show tank.
Starting a shrimp tank is a great option, but I'd be very curious about your options in the netherlands. Does amazon have a netherlands option?