Old Roland equipment value

Hey guys, I've joined the group again and am not planning on 
bombarding it with tons of questions.  For now, there is just one.  I 
have:

Roland gr-505 with original case- sunburst great condition
Roland gr-300
Roland gr-100
24 pin cable
Gm-70 midi converter.

However, I never really use it that often.  I am in a band and need 
money right now to get things started and was wondering if the prices 
are going to change much on what these sell for.  I don't want to 
sell them if units like the gr-300, being an old great analog synth 
unit, is going to triple in price in the next few years or anything 
of the sort, because I wouldn't be too happy that I sold it.  Are 
items like these likely to go up in price much because they are old 
and analog or what?  And if not, what would be an average price that 
I could get total for all of the above?  I appreciate any help.

-Russ


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