We collect IP addresses, browser information, and cookies for all users. We use this information for analytics to improve the browsing experience.
For users who make purchases we also collect email addresses (so we can contact the customer if there is an issue with an order). For credit card purchases we collect credit card information and related information necessary to complete the transaction (credit card number, name, mailing address, etc).
We do not currently respond to "do not track" signals or similar mechanisms. We already limit the personally identifiable information we collect to the bare minimum in order to gather anonymized usage information and to facilitate transactions.