How do you deal with a vendor whose final invoice is substantially higher than their initial estimate?

Our reader poll today asks: How do you deal with a vendor whose final invoice is substantially higher than their initial estimate?

I just pay the invoice 3.22%I negotiate with them to get the final price down a bit 34.41%I offer to split the difference between the estimate and final bill 6.42%I offer to pay slightly more than the initial estimate 8.71%I hold them to the initial estimate they provided 47.24%

Holding them to the estimate.

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