The ticket prices are:
Developer Pass (Over/Under 16) - $75 USD
Chaperone Pass (Only needed for Under 16 devs) - $50 USD
Hotel (2-night stay) - $200 USD
You may or may not have to pay for all of these together, what you buy depends on what you need.
The food is completely covered along with the ticket price. You don’t need to pay for dinner on the first day for the Welcome Party or breakfast for the other two days. You may need to pay for other food if you want to eat outside of the times food is available at RDC. There’s a cafe inside the hotel (although a lot of their items are expensive). You can go around outside the hotel and find some food. Last year, I used an Uber and walked to Panda Express to get food when I arrived at around 9 AM PST.
As for transportation, the Uber/Lyft prices are surprisingly not as high as you might think they are. It still depends on distance, but generally, you’ll be paying between $10-$25 a ride (depending on where you go)