Here are reputable Wix development agencies and places to find certified Wix partners in the USA, with a short note on what each is good for and a source you can check:

• NB Media Solutions — Certified Wix partner in Grand Rapids, MI; focused on Wix site builds and SEO for small–mid businesses. (designrush.com)
• Operation Technology — Chicago-based Wix website design + digital marketing (lead generation, e‑commerce). Good for SMBs. (designrush.com)
• Phantom Eye Design — Custom Wix sites and branding for growing businesses (Athens, GA). Good if you want design + brand work. (designrush.com)
• Humbleteam — US/North America + Europe presence; UX/UI + branding-heavy Wix builds; more startup/product focus. (influencermarketinghub.com)
• PickleWix — Denver agency that specializes in Wix design and client training; useful for local businesses and ongoing support. (influencermarketinghub.com)
• Big Red Jelly — US-based Wix specialists combining brand strategy and Wix development; good for businesses that need strategy + build. (enzuzo.com)
• NinjaPromo — Full-service digital agency that builds Wix sites and handles marketing; mid-market budgets. (influencermarketinghub.com)
• CIS Agency (WeAreCIS) — US Wix partner offering Wix builds, Velo (custom code) and white‑label services; good for complex integrations. (wearecis.com)
• ControlF5 (Upwork agency listing) — Large shop with Wix experience among many web development services; good if you want a team with broader dev capabilities. (upwork.com)
• Wix Marketplace — Wix’s official marketplace to find and hire certified Wix professionals across the US; shows starting prices, ratings and Wix certifications (fast way to compare many vetted partners). (wix.com)

Quick tips for choosing a Wix developer

• Check live Wix portfolios and ask for examples of similar industries or features (booking, membership, Velo custom code, multilingual, e‑commerce).
• Confirm whether they use Wix Studio and/or Velo (important if you need custom code or advanced integrations).
• Ask about maintenance/SEO and who will own the Wix account and content after launch.
• Compare 2–3 quotes and timelines; typical small business Wix site builds commonly range from a few hundred to several thousand dollars depending on scope (see Marketplace starting prices). (wix.com)

If you want, I can: (a) pick 3 agencies from the list matched to a budget range you have, or (b) draft a message/template you can send to them to request proposals.