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This line is indeed expensive! It's good, but not thát good imho.

Perfume Samples, Colognes, and Fragrances | MyPerfumeSamples.com
Seems a good place to start as they have many more commercial perfumes!

If you google "fragrance perfume decants samples" you will find quite a few companies that can deliver this. I have ordered from theperfumedcourt and luckyscent in the past.
I would say: look at...

What I read is: you just want something that smells nice :)

What are Colognes for you ?
Are you talking about fragrances in general, whatever the concentration they come in ?
Fragrances with a low scent concentration ?
Or as in the style of fragrance...