hi
pest18
try ebay...i always see loads floating round there, and as i guess you are stateside, you won't have to pay stupid shipping charges to get it to you!
http://search-desc.ebay.com/search/search.dll?query=heinkel+111+1%2F48&catref=C3&ht=1&sosortproperty=1&from=R10&sacategory=1188&sotextsearched=2&BasicSearch=
this search may not be an exhaustive one but gives you the general idea. i have basically the same kit except here (UK) it's re-boxed as a revell kit...going to do a battle of britain version...
hope this helps.
regards,
nick