CustomUBlockScripts.js

/// InstacartSponsoredItemsBlocker.js
console.log("InstacartSponsoredItemsBlocker started");
document.addEventListener('DOMContentLoaded', (event) => {
  // remove sponsored items
  // setInterval(() => [...document.querySelectorAll('li')].map(elt => elt.innerText.includes('Sponsored') ? elt.style.display = 'none' : null), 500);
  // make sponsored items have low opacity
  setInterval(() => [...document.querySelectorAll('li')].map(elt => elt.innerText.includes('Sponsored') ? elt.style.opacity = '0.15' : null), 500);
  // give "likely out of stock" items a pink background
  setInterval(() =>
    [...document.querySelectorAll('li')].filter(elt => elt.innerText.includes('Request')).map(elt => {
      elt.style.padding = '8px'
      elt.style.backgroundColor = '#ff9999'
    }),
    500
  );
  // sort by lowest price
  const sortByLowestPrice = () => {
    let lowestPriceInterval;
    lowestPriceInterval = setInterval(() => {
      let seeLowestFirst = document.querySelector(`li[id*='priceAsc']`);
      if (seeLowestFirst) {
        console.log("sorting by lowest price!");
        clearInterval(lowestPriceInterval);
        seeLowestFirst.click();
        seeLowestFirst.click(); // click again to remove dropdown
      } else {
        // console.log("not yet sorting by lowest price");
      }
    }, 500);
  };
  sortByLowestPrice();
  // sort by lowest price any time url changes
  let pathname = { current: window.location.pathname };
  setInterval(() => {
    if (window.location.pathname !== pathname.current) {
      pathname.current = window.location.pathname;
      sortByLowestPrice();
    }
  }, 500);
});

uBlock Origin instructions:

1. Add to filters

• Go to uBlock Origin settings > My filters
• for me this is at chrome-extension://cjpalhdlnbpafiamejdnhcphjbkeiagm/dashboard.html#1p-filters.html
• Add instacart.com##+js(InstacartSponsoredItemsBlocker.js)
• (The first line of this gist is /// InstacartSponsoredItemsBlocker.js which is where uBlock gets the filename from, with the file being the block of content below it, and I believe a blank line is considered to signal the end of the file which is why there are no blank lines)

2. Add to userResourcesLocation

• Go to settings > Advanced > I am an advanced user
• for me this is at chrome-extension://cjpalhdlnbpafiamejdnhcphjbkeiagm/advanced-settings.html
• Set userResourcesLocation to https://gist.githubusercontent.com/raphaelrk/da99f0f06110374e36361e3c42e7e0f2/raw/c61b8a8342dd0eb9b0a913c735461882929f44d2/CustomUBlockScripts.js

For more information see Scriptlet injection. There's also a uBlock subreddit.