How do I scrap ebay for UPC

I can code it myself, But I think if I will go the straight forward way by just requesting the item page,
Ebay would use captcha on me, And I would like to avoid that.

I even checked ebay API, But it seems I could only request one item upc at time, They don't seem to have a request that gets multiple items, And I am limited to 5k request each day and I already use some of the API for something else.

I need to scrap UPC for 1000-10000 items a time, What's the best way to go about it?

Here you go: http://developer.ebay.com/Devzone/shopping/docs/CallRef/GetMultipleItems.html. You can fetch 20 items using this call.

As for calling limits, you should create a very simple "Product search website" and get it approved from eBay. That will raise your call limits to 1.5mil/day. The approval process might seem daunting at first but it's not really. I've done it, a friend did it and we were both unsure before we did it. Once you've got your "search website" up you just need to buy 1 hour of premium support from them for $75 and fill out a form detailing how you've protected your site against XSS injection etc. Let me know if a particular question trips you up. I think I have my original form saved in mail somewhere.
They are not particularly quick to approve but just send them a polite daily reminder and ask counter-questions in the form of seeking advice. They'll approve without asking too many questions.