Please contact me before accepting bid. I need more information to know whether a bid of $250 is reasonable, or whether it would be a large loss for me. Could you provide me with the website from which you wish to extract data? If the data on the website is provided in a "nice" format, the project might be fairly easy. If not, it might be fairly hard.
Also, please be aware of the following issue. What you are describing is called web page "scraping". Unfortunately, you, as the end user have no control over changes to the website. A program that correctly extracts your data today, will almost certainly not work in five years. There is a reasonable chance it won't work in 2 years, and although unlikely, it might not even work in 6 months. Because of this problem, some websites offer an "API" which allows programmers to interact with the website's data with substantially reduced risk that the means of accessing data will change in the short term. So, the website you wish to access is an important variable that needs to be considered when writing your application. My hourly rate is $40/hr. However, I am happy to quote you a fixed price if I receive more details of the project.