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noone will sell steam gift for 5keys (steam never had it cheaper than $15, and once for few hours on flash sale for $10 that most ppl missed)
but you never know :)
theres a few gift copies out there, but they go for like 10-15keys lol. VERY rare, so yeah unless your willing to spend that much, the nonsteam one is the way to go. not trying to be discouraging, but just letting you know to save some time lol.
I have 5 tf2 keys for The Secret World.