Yes, a company named LeadsHub.com offers SMS widgets for Shopify stores. Their basic package costs $45/month and allows up to 5 agents to handle incoming messages from a textable number. They also have 14 days trial. Here's an example store using it: www.homeownerdesigns.com (the widget has an 8 second pop-up delay) Here's their SMS widget instruction video for Shopify: https://youtu.be/qLus3nHCnJs
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