Why do we ask how much you are willing to pay, if necessary? While TRL does not charge for ILL service, many other libraries do. We always try to fill your requests for free, but some things are only available from locations that charge fees. You will never be charged more than you have agreed to pay. Letting us know in advance how much you are willing to pay, will help us obtain your copy sooner if payment is necessary. If you don't wish to pay any fees even though your article isn't available for free, that is okay. Just enter 0 in the payment field.