New Scientist is offering a 10 week subscription (10 issues) delivered & digital for $20. Normal price is usually $8.74 per issue for print & digital or $6.74 per issue for print only (in a six month subscription). Good magazine.
For ten weeks only, but since you can set your subscription in the future you could probably buy several and stagger them to get a continuous super cheap subscription. If anyone manages to do that, please share!
Sign up via Paypal so you just need to cancel the subscription within Paypal instead of via credit card/debit where you'll have to contact customer service to cancel.