This is a regular verb. It follows the conjugation pattern of the verb hablar.
Present:
Compro fruta en el mercado los sábados.
I buy fruit at the market on Saturdays.
Preterite:
Le compré un regalo a mi mamá.
I bought my mom a gift.
Negative Imperative:
No compres nada sin comparar precios.
Don't buy anything without comparing prices.