Online campaign for a webshop.

I have a limited budget to advertise my shop online and I am wondering about the best way to promote it.

I am currently targeting foreign residents in the country I am living in, therefore the ads must be targeted to this niche.

Here is my list of pros and cons of the options that I already considered, please let me know what you think:

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Adsense:

Pros: Targeted traffic from blogs/sites owned by members of the targeted group.

Cons: High risk to have my ads on irrelevant site.

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Adword:

Pros: Can increase keyword motivated traffic.

Cons: I am on my way to rank 0 so I am not sure It would be the best, however my keywords might be pretty cheap.

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Facebook:

Pros: Super targeted traffic.

Cons: Price ?

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Thanks!

For me .. I really don't have enough information to be able to direct you ...

We don't know how your on-page seo is structured initially .. what niche we're talking about and the type of competition for your shop ..

there are an absolute bundle of way to promote your site for free as long as the foundations are secure and you don't mind a little delay while things improve .. if you want instant gratification for free, then that is maybe a little too much to ask ..

Respect, Goldie...

My business is a conventional modchip/accessories online store.

I have already started to build links (WH), optimize keywords, etc..

Since the business is "legit", I am trying not to use too many BH tricks.

The main focus at the moment is to increase quality traffic and eventually sales.

Let me know if you need more info!