The best replacement for kreg jig is harbor freight.

The best alternatives to kreg jig are rated as following:
★★★★★  harbor freight
★★★★  kreg jig jr
★★★★  biscuit joiner
★★★  biscuit jointer

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Speaking about kreg jig, one probably shouldn't forget about regular screws.

Other search terms related to kreg jig and their ratings are:
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kreg jig
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kreg jig jr