Drag one button. Price the exit before buying the bike.

(function regretLensRuntime(rules, homeUrl) {
  "use strict";

  function normalizedHost(value) {
    return String(value || "").trim().toLowerCase().replace(/^www\./, "").replace(/\.$/, "");
  }

  function brandForHost(hostname) {
    const host = normalizedHost(hostname);
    const match = rules.find((candidate) => candidate.hosts.some((configuredHost) => {
      const configured = normalizedHost(configuredHost);
      return candidate.exactHost ? host === configured : host === configured || host.endsWith(`.${configured}`);
    }));
    if (match) return match.brandId;
    const destinationHost = normalizedHost(new URL(homeUrl).hostname);
    if ((destinationHost === "localhost" || destinationHost === "127.0.0.1") && host.endsWith(".localhost")) {
      const localBrand = host.slice(0, -".localhost".length);
      return rules.some((candidate) => candidate.brandId === localBrand) ? localBrand : "";
    }
    return "";
  }

  function priceNumber(value) {
    const normalized = String(value == null ? "" : value).replaceAll(",", "").match(/(?:USD\s*)?\$?\s*(\d+(?:\.\d{1,2})?)/i);
    if (!normalized) return null;
    const amount = Number(normalized[1]);
    return Number.isFinite(amount) && amount >= 200 && amount <= 15000 ? Math.round(amount) : null;
  }

  function offerPrice(offer) {
    if (!offer || typeof offer !== "object") return null;
    if (Array.isArray(offer)) {
      for (const item of offer) {
        const found = offerPrice(item);
        if (found) return found;
      }
      return null;
    }
    return priceNumber(offer.price ?? offer.lowPrice ?? offer.highPrice ?? offer.priceSpecification?.price);
  }

  function productPrice(value) {
    if (!value || typeof value !== "object") return null;
    if (Array.isArray(value)) {
      for (const item of value) {
        const found = productPrice(item);
        if (found) return found;
      }
      return null;
    }
    const types = Array.isArray(value["@type"]) ? value["@type"] : [value["@type"]];
    if (types.includes("Product")) {
      const found = offerPrice(value.offers);
      if (found) return found;
    }
    if (value["@graph"]) return productPrice(value["@graph"]);
    return null;
  }

  function structuredPrice() {
    const metaSelectors = [
      'meta[property="product:price:amount"]',
      'meta[property="og:price:amount"]',
      'meta[name="product:price:amount"]',
      '[itemprop="price"][content]',
      'meta[itemprop="price"]'
    ];
    for (const selector of metaSelectors) {
      const element = document.querySelector(selector);
      const found = priceNumber(element?.getAttribute("content") || element?.getAttribute("value"));
      if (found) return found;
    }
    for (const script of Array.from(document.querySelectorAll('script[type="application/ld+json"]')).slice(0, 20)) {
      try {
        const found = productPrice(JSON.parse(script.textContent || "null"));
        if (found) return found;
      } catch {
        // Ignore invalid retailer markup and fall back to a visible price field or prompt.
      }
    }
    const itemprop = document.querySelector('[itemprop="price"]');
    return priceNumber(itemprop?.textContent);
  }

  const brandId = brandForHost(location.hostname);
  let price = structuredPrice();
  if (!price) {
    const entered = prompt("Regret Lens could not reliably find the full bike price. Enter the purchase price in USD, or leave blank to choose it on Skinflint:", "");
    price = priceNumber(entered);
  }

  const target = new URL(homeUrl);
  target.searchParams.set("utm_source", "bookmarklet");
  target.searchParams.set("utm_medium", "tool");
  target.searchParams.set("utm_campaign", "regret_lens");
  target.searchParams.set("utm_content", brandId ? "supported-store" : "unsupported-store");
  const privateState = new URLSearchParams({ condition: "ridden" });
  if (brandId) privateState.set("brand", brandId);
  if (price) privateState.set("price", String(price));
  target.hash = `calculator?${privateState.toString()}`;

  const opened = window.open(target.toString(), "_blank", "noopener,noreferrer");
  if (opened) opened.opener = null;
  else location.assign(target.toString());
})([{"brandId":"lectric","hosts":["lectricebikes.com"]},{"brandId":"aventon","hosts":["aventon.com","rideaventon.com"]},{"brandId":"velotric","hosts":["velotricbike.com"]},{"brandId":"rad-power-bikes","hosts":["radpowerbikes.com"]},{"brandId":"ride1up-revv1","hosts":["revv1.ride1up.com"],"exactHost":true},{"brandId":"fiido","hosts":["fiido.com"]},{"brandId":"himiway","hosts":["himiwaybike.com"]},{"brandId":"hovsco","hosts":["hovsco.com"]},{"brandId":"ecotric","hosts":["ecotric.com"]}],"https://skinflint.ai/");

Open the readable JavaScript file