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You'll spend about $50 more than your budget, but check out Vortex red dots. They are very durable and have an excellent warranty, basically unlimited lifetime. I work in a shop that sells Vortex and we have sent 3 scopes back to them no questions asked. They have always told us to give the customer one from stock and they will back fill our stock. The only red dot we've returned was because the customer hit it with a hammer on purpose. Again, no questions or issues returning it.

UTG flip up sights are a great option. Similar to the Magpul MBUS. Made from aluminum vs plastic for MBUS and usually under $60 for the pair.

Good luck!