They used to could buy it.
source:
LAGS
Entry:
635
Example:
They used to could buy it.
Modal 1:
used to
Modal 2:
could
Gender:
Male
Race/Ethnicity:
White
Age:
70
Level of Education:
9th grade
Home Community, Town, or State:
GA (Cordele)
Location Collected:
GA (Cordele)
Year:
1976
Relation to Addressee:
subject to fieldworker
Medium:
Spoken
Sentence Structure:
1.0
Status:
Naturalistic