You used to buy that.

source: 
LAGS
Entry: 
636
Example: 
You used to could buy that.
Modal 1: 
used to
Modal 2: 
could
Gender: 
Male
Race/Ethnicity: 
White
Age: 
79
Level of Education: 
3-4 years of school
Home Community, Town, or State: 
GA (Fayette County)
Location Collected: 
GA (Inman)
Year: 
1973
Relation to Addressee: 
subject to fieldworker
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic