:salamext:
In addition to what Woodrow said, in case you still need a dictionary the best one I know off for Arabic to English is the Hans Wehr dictionary.
The price range for this dictionary can very from country to country but I recommend that you do
not settle for the first price you see. Some places, for example in the United Kingdom, sell these dictionaries for £15, other places sell them for £10, places like eBay sell them for even less than that. So look around until you can find the cheapest price.