ADKS-800 and ADKS-1200 have been particularly hard to get this season. Wrap-on has stepped up to the plate and is able to make hundreds per week of a direct size substitute:
160 Foot:
https://morelectricheating.com/default.aspx?page=item+detail&itemcode=WRAPON14161
240 Foot:
https://morelectricheating.com/default.aspx?page=item+detail&itemcode=WRAPON14241