As I have noted on other boards, I had a year-long battle with look.ca to stop billing my credit card--a good two years after I had used the card! I would steer far and wide from this absolutely low-rent scamarama.
They blamed a "database error" for billing 1000's of users cards, in some cases for thousands and thousands of dollars. My own battle with the CEO to stop billing my card culminated in me threatening to buy a billboard at the corner of Yonge and Bloor to broadcast their ineptitude.
My simple advice to you: Don't give them your credit card. You'll regret it.
Don't say you weren't warned.