Why is Half-Life: Source not eligible for Valve coupons?

Question

According to this Steam Inventory thingy(the link will show a different inventory for you, obviously), I have a 33% off coupon for Valve titles:

33% off any one title on Steam listed with Valve as the publisher.

However, Half-Life: Source does not appear in the List of applicable games for that coupon. Even though the Game Details say

Title: Half-Life: Source
Genre: Action
Developer: Valve
Publisher: Valve
Release Date: 1 Jun 2004

So how can I use this coupon to save the incredible amount of 1,65 EUR?

Answer

All coupons aren't valid until January 2nd. While I understand that HL:Source doesn't show up on the applicable games list, the coupon is valid for it.

Note that HL:Source and HL:Source Death Match are already 50% off right now, so you might as well purchase it before the sale ends as it is a better deal than the 33% coupon would give you anyways.

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