Ivacy doesn't advertise them much, but there are a couple of trial options (they're linked from this support page). You can get one day entirely for free, or buy a week's coverage for $0.99. Beware, though: the 7-day trial automatically renews as the annual plan, unless you cancel. Fortunately, even if you sign up and regret it, you're further protected by a 30-day money-back guarantee (or 7-days for monthly-billed accounts).