Last summer I bought a total of five kits from N3ZI. I bought blue two line displays from a Chinese vendor on eBay. The kits were under $20 each w/o display. It looks like he has raised the price this year to $25. The displays were cheap, too.http://www.pongrance.com/ddfc-cc.html
This is how I ended up putting them in cabinets. viewtopic.php?f=10&t=167506&start=20
They are very easy to build and LOTS of fun to use. There is a little tinkering around with the attachment to the radio.
Will be glad to advise you more.