Here is another interesting NPN part that I found on someone's
RF blog.

http://www.datasheetcatalog.org/datasheets/400/74256_DS.pdf

$1.82 in quantity of 1 from Mouser. It looks like it is good into the VHF/UHF range
and should be able to make 1W of power without crazy amounts of current. It looks
like a 10dB gain kind of part