Try these spots for your fabric ......
www.jandofabrics, com/products, asp? id=3 ... (jump to 13,14,15 page to see all tweetys fabrics)
cartoon fabrics, com
If there are fabric stores near you, call to check if they carry anything like that or if they special order and if that is a choice. Also try on line. Ebay may have many choices. Just don ' t forget there are shipping charges. There may be fabric stores on line that carry some also. Again, there will be shipping costs.
If all else fails, there should be a website for the company (like disney) who has the rights and you can ask if they carry any & where you can get it. Another possibility would be a computerized sewing machine and make your own.