Bythedozen

2 clues
In large quantities
Way to buy doughnuts
Similar answers:
Abidebytherules
Adimeadozen
Adozen
Adozenredroses
Adozenroses
Anevendozen
Atigerbythetail
Attackedbythepress
Babytherock
Baghdadbythebay
Bakersdozen
Batmakersdozen
Bikersdozen
Breaksdozen
Bythe
Bythebeautifulc
Bythebook
Bytheby
Bythebye
Bythedawnsearlylight