There is a swapfest here in CO on 4/1.  I thought I would ask people about
useful things to look for and what is a reasonable price.  
In particular, I am interested in transformers, variable, potential, pole,
and current, ammeters, signal generators, oscilloscopes, and RF filters.  
Are there any other items that I should keep my eyes open for?  What is 
a fair price for some of these items?  What items are most useful?