This tip comes from a comment on the article Save 20% on gift cards at Costco.
The commenter there wrote:
"Costco now also sells "The San Diego Gift" online at the Costco website. The Gift Card is accepted at over 100 Restaurants in San Diego, and many other restaurants in select cities.
Two $50.00 Gift Cards for $79.99.
So if you're in the San Diego area or plan to go there soon then you might want to check out these gift cards at Costco for sale at this page.