Any suggestions on cafes or restaurants that are reasonably priced in pricey Deauville??
Go to less pricey and less posh Trouville, not far away.
See my post on this topic http://www.ricksteves.com/graffiti/helpline/index.cfm/rurl/topic/29414/nice-meal-out-in-paris.html, same method in Deauville as in Paris, look for the Michelin Bib Gourmands category for good food at moderate prices.