Why not become an ISBT member and register for the congress at the ISBT member rate, thus saving on the registration fee and receiving all the benefits of ISBT membership for one year. For example: subscription to Vox Sanguinis, receipt of Transfusion Today, online access to congress webcasts, and online access to Working Party material.
You will need your membership number to receive the ISBT member discount. You can find this:
a) on your invoice (which you can download)
b) on your membership card (which you can download)
c) by clicking on 'My ISBT' (after logging in), and then on 'edit profile'