How do I find out about store sales?

My friend managed to get everything on sale. He got a new computer with screen $ 200 and as he is better than what we have we got for about $ 600. He got it at some random sale in a shop that has been similar to Black Friday Agreement. How does he find out about these things and how do I do?

If you like a store, see if she has a website. Put your email address in the e-mail notifications whenever possible. Sometimes, just hit lucky

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