Call from Apple Support asking me if gift cards for Apple.com were purchased by me. Is this scam?

Scams (e-mail, text messages, and phone calls) are getting very good at closely imitating true Apple communications. Always be cautious. Here are some guidelines:

Identifying legitimate emails from the iTunes Store - http://support.apple.com/HT201679 - lacking in specifics, the next link is better:

Recognize and avoid phishing messages, phony support calls, and other scams - https://support.apple.com/HT204759

Apple won't call you unless you have asked them to do so.