Albert Adria's other restaurant and some of the food is the same as Tickets.
It's really laid back and the food is amazing. It was much cheaper and Tickets as well, but just as good. This is more classic tapas focused.
I would also just wander through Mercat de Sant Josep and pick up food there from the vendors. We did that for lunch one day and had some really good nibbles.
The St. Joseph's Market is amazing one of my all time favorites,avoid Bar Pinxto. They don't post prices, and since they were in Rick Steves' Guide book charge way to much. It was the one and only guide book restaurant I've been to, that was supposed to be good value and it wasn't.