Heck, if you live in a city with a techie population, then buy a bunch of cards, throw them in a bucket, then sell them for a 1% markup, in cash, at any tech meetup you attend. Buy more cards periodically and toss them into the bucket for people to pull at random, so there's no plausible correlation between time of issuance and time of use. This also covers your own tracks as well, if you ever need a VPN.