install price might be a bit high, depends on where u are located i guess. i paid 150 for mine.
i don't know about the reflash price. sounds high though.
u can get a super chip custom tune from kenb at modular depot for alot less than either of those 2 options. u can install yourself in about 15 min. unless u are going for a dyno tune or something.
The gear/install prices are in line but the computer re-flash is way out of line if its for the speedo correction. I took my ECM out and sent it to Tim @ T&J performance and he did the re-flash for $109 including return shipping by next day air. Took the ECM out on Monday and it was back in the car on Wednesday. He can also re-flash the timing while he has the ECM and that is another $100 for a total of $199.