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買えば

if (I/you/we/they) buy, if (I/you/we/they) were to buy

→ 買う
買え buy + ば Conditional (“if”)
verb · informal Rare #44,332
if (I/you/we/they) buy, if (I/you/we/they) were to buy The conditional form of 買う; the subject is understood from context.
JA: 安ければ、この本を買えばいい。
EN: If it’s cheap, you can buy this book.
Conjugation of 買う

君は食べ物を買ったのだから僕がワインを買えば五分五分になる。

Since you bought the food, if I buy the wine, we’ll be even.

どこで切符を買えばよいか教えてくださいませんか。

Could you please tell me where I should buy a ticket?

買えばな

If you buy it.

— 万引き家族 (2018)

たくさん買えば、値引きしてくれるのよ。

If you buy a lot, they’ll give you a discount.