EDN is offered as an annual subscription. You can optionally add ArcGIS for Desktop (Basic, Standard, or Advanced).

One Developer Support (DS) credit is provided with each EDN subscription, and additional DS credits (2, 5 or 10) can be purchased as required.

For pricing:

Call: 01296 745599 (9:00 a.m.-5:30 p.m. GMT, Monday-Friday)