Did God say you can't afford it? The Word says that God shall supply all your needs according to His riches in glory in Christ Jesus. Is your checkbook telling you that you can't afford it? I know the demonic realm is telling you that you can't afford it. Whoever we come into agreement with is what we are going to get.
Proverbs 18:21 Death and life are in the power of the tongue, and those who love it will eat its fruits.
Your words that you speak, or write are of life, or death. Whatever seeds, words, we sow will determine our crop in the future, tomorrow.
Instead of looking at the repair as an expense, ask the Lord who He wants to bless through you. Paying for the repair will be a blessing to the person doing the repair.
Be in agreement with the Word and start confessing what the Word says. Speak "I am blessed, and I shall be a blessing to others, everything I have is a blessing, everything I do is blessed." Thank you Jesus.