I have seen some agency services offering this in the US, you have to pay some precentage of the credit line about 10% or 20% of the credit line... not sure if this is for real.
You should bear in mind that at least the banks I know will check the new owners of the company and may ask for additional security in order to maintain the credit line for the company after a sale.
For instant we have a 1985 aged company for sale which is incorporated in Cyprus, it has all annual reports etc. and a established bank account and credit line, however, if the new owner want to take over the company and need the credit line the bank will most often have several demands / requirements in order to keep it.
Thank you both, I also found a few US companies offerint credit lines in the range of $1 million but they look dodgy and I don't need a credit line such high...
I'm interested in the aged 1985 company you have, will get in touch...