Heil ves þu John!
There no ON dictionaries in print, but if you want one enough, you can buy a used dictionary ( 
       
Concise Dictionary of Old Icelandic by Geir T. Zoëga)  for about $200 on the internet.
 
Or you could go to on of these sites: 
 
http://www.geocities.com/ordlag_godvegr/ON_Links.htm
Click:  A Concise Dictionary of Old Icelandic by Geir T Zoega
 
or:
 
http://www.midhnottsol.org/zoega/index002.html
 
Save them all and then print them out, bind them (suppliers like Office Max has paper binding solutions)  and you have his dictionary. I hope this helps.
 
 Bezti,
Anþanrikr
 
 
 
What is the current ON->English or English -> ON dictionary situation?  Is there still not a dictionary in print?