I'll give you 3 keys for it.
Gordon Freeman (Foil) - $7.62 USD.
6 Mann Co. Keys. ~$2 USD each, or $12 USD total.
This data is taken here: http://steamcommunity.com/market/
1 decade ago
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Closed 7 years ago.
New Bundles
[Have]
HL 2 - Gordon Freeman Foil Card
[Want]
4 RoboCrate Keys
or
5 Mann Co. Keys