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But "miss this bargain" is not authentic native speech.
And "it" is not really "this bargain"; "it" is the thing you are going to buy.
Also the original sentence is very wordy. Something like the following is more likely to be said by a native speaker. I think I'll buy it now. If I don't, someone else (probably) will and I'll miss a bargain.
that's what i am looking for: the way a native would speak.
there's one thing i have noticed: natives do not understand you easily if you do not speak like them (even when you speak a grammatically correct english...).