It’s dirt cheap. Heat up your soldering iron, because you have to assemble it yourself. Capable of handling 15 Watts (probably not for too long) and usable up to 30 MHz.
Great fun for almost nothing, just what QRP fans love. One drawback: you better start practicing on winding toroids (my favorite pastime… NOT).
You can order one here, shipping is free.
I ran into an nice project, Rádio de Galena, a crystal radio that can be build by anyone, thanks to the brilliant way the circuit board is designed: just a piece of wood with an explanatory piece of paper on top. Website: Club S500.
Such a project brings back memories — an Amroh crystal radio was my first home-built radio. After that I was hooked. There’s a Dutch ham, Chris PE1DZX, selling similar kits at http://www.kristalradio.nl/.