I believe you are looking for IAP Arubacare support. The Sku should be something like
SN1-IAP-215-RW
SN1 is one year. Replace the 1 with anything from 2-5 for multi year support.
215 would be replaced by the model you want support for, and 'rw' would be replaced by the region, likely -US or -RW, unless you are in Japan or Israel.
Some more info about Arubacare support: http://www.arubanetworks.com/pdf/support/ds_arubacare_us.pdf
_ELiasz