Look at what King David said and did about sacrificing offerings when he was given an offer by one guy named Aruanah to take all he needs for sacrificing for free:
2 Samuel24:18-25. No,I will not offer burnt offerings to the Lord my God which COST me NOTHING .” So David purchased the [d]threshing floor and the oxen for fifty shekels of silver. 25 David built an altar to the Lordthere, and offered burnt offerings and peace offerings. So the Lord was MOVED [to compassion] by [David’s] prayer for the land, and the plague was held back from Israel.
Wow, how amazing is David's heart? I am really impressed by his heart when it comes to sacrificing an offering to the Lord. Let's give God our best, the thing we value the most, an offering that costs us something excellent and that is ourselves. Our bodies as a living sacrifice, our thoughts and resources as a pleasant offering to the Lord our God. Roman 12:1-3,