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MCM Electronics has a Raspberry Pi Accessory Bundle for $ 25 [mcmelectronics.com]. It includes an Official Raspberry Pi Camera ($ 25), a WiFi Module ($ 8.99) and a Case ($ 8.99) all for $ 25. If you own a Raspberry Pi these are all items you’re going to purchase anyway so it’s a no-brainer.
I purchased two to build an IP surveillance system [github.com].