Hi Lars,
Do you want your original script modifying, or do you want an entirely new script writing?
Either way, I'm fairly certain I can deliver your scraper (in perl) within 24 hours. It normally takes me just a few hours to write a scraper, but I wouldn't be able to start this until tomorrow evening, so you'd have your scraper by this time tomorrow probably.
If you are desperately in need of this right now, I could start work now and have it ready in a few hours for 250 euros.
By the way, is it just the ASIN that you need, or more data?
Best wishes,
John