Silver scalpels cannot be traded. They are event items to be used during this event only. They can be obtained by ranking in the previous event (a little late for that now though), playing the current event and hitting specific BT point numbers or training stages, or by purchase card packs for money.
If you were hoping to bribe forum members into allying with you and sending you a scalpel for the 2.5 million damage they do to Anneliese, then I suspect luna won't convince anyone it's worth the hassle, and anything else would be overpaying for the service.
For future reference, you're more likely to get a response to an event specific question in the event thread. For this event, it can be found here: http://www.fantasicaunofficial.com/t11241-training-blood-drive-december-9th-2014-december-12th-2014