Yes, not just the tire price but also the car performance and comfort level especially if change to 17'! If upsize to 16' then can still have a bit of comfort left but your tire price will be much more expensive than 15', almost double. If change to 17' then will be even more expensive and comfort will be practically gone, plus performance will be noticeably slower too due to much heavier rims! FYI I just bought a small hatchback for my son which came with 17' and super thin 205/40 tires. After driving it for just 2 weeks I could not stand it and changed the rims to 15' with 195/55 tires and the now car feels and drives sooooo much better! So yeah think carefully before upsizing, especially for small cars.