[Mr Rick]

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Motel 6 in Niantic is pretty cheap, relatively clean and fairly safe.20 minute ride to Foxwoods.

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I use kayak.com Hotel search, @ Groton CT.

For Saturday nights the Niantic Motel 6 is the cheapest (summer rates $89.95+ tax and $84.99 if you click on Motel 6 special rate on-line when available). But this is 25+ minutes from Foxwoods.

All other nights Econolodge, Groton (used to be Sojourner Inn) is cheapest or comparable. With enough time in advance it can be as low as $48+tax. And every 10 nights stayed you get a $50 credit on the next night. This is 15+ minutes from Foxwoods.

Both of these offer check-in anytime (up until 5am or so) and cancellation policies vary (Econolodge is 24 hours in advance).