The regular black light that I use is ancient, quite possibly older than me, but I picked it up super-cheap on eBay. My experience is that, generally speaking, the tube-type black lights tend to cast a wider, more intense light better suited to examining larger objects. The LED (usually flashlight-type) models are more portable, but tend to be either weaker or have a more narrowly focused light (so you have to hold them almost right on the object). Both are useful in different situations.
Just did a quick scouting run on the bay, and a couple of more modern options:
Handheld battery-powered tube-type bulb light (I might actually pick up one of these too, as I do get tired of being tethered by the cord on my main one):
http://www.ebay.com/itm/BLAZING-BLAC...item43adbfa483
"Flashlight" style led (I have a similar one, though not this exact model. Good for portability, works well in complete darkness, but not as powerful as the tube-type lights):
http://www.ebay.com/itm/14-LED-380-4...item2c683f17ad