What is the cheapest option for a Windows laptop with 4gb ram?

I want a simple laptop that runs Windows (preferably 7 or higher) with 4gb of ram. I love my Nextbook Flexx (especially the price), but having only 2gb of ram makes it difficult to complete some multitasking. Are there any options below $150? A 2-1 laptop would be optimal, but beggars can’t be choosers ;)
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