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There is an exception for F2P games:
Booster packs are randomly given to eligible players. They're quite rare, especially at lower levels, and I personally wouldn't recommend relying on them to complete a set.
You can find more info on trading cards here: http://steamcommunity.com/tradingcards/faq/
Depends how important Steam levels are to you and how much time and money you're willing to put into it. If you have any extra (duplicate) cards or other items you can trade, you can trade for the cards you need. Or you can sell those items on the Community Market and use any funds generated to purchase the cards via the market. Or if a couple of bucks means little to you and you want to save time, you can add wallet funds to your account and just purchase them outright via the Community Market.
Most people have strict 1:2 rules (one of their cards for two of yours), but you will have a high chance of finding 1:1 offers for Gmod.
And if you reeaally want those cards and are willing to spend a few pennies, you can go into the market and search for your cards there; prices are always changing and occasionally someone will set their price lower than others. The highest amount I've ever spent on a card was .07 cents, lowest being .01-.03 cents.
Or what you could do is sell your L4D2 cards and use that profit for Gmod cards. Just some suggestions!
Goodluck!