We invented a game where winners go to sponsoring ecommerce sites to redeem their prize. We guarantee site traffic and site pays nothing until a player selects their prize on their site to redeem
Email is likely a poor choice for this.
Reminds me of the guy who goes to a bar + tries to hook of with strangers. To many steps missed between initial meeting + hoping into the sack.
Repeat/Persistent business builds on relationships.
Rather than email, go speak at local events. When you're comfortable, go speak at any of the 100s (1000s if you count all weekly https://Meetup.com groups) of E-Commerce industry conferences/events.
Affiliate Summit + PubCon come to mind.
If you've never done marketing by speaking at conferences, you can book a call with me or likely many others.
Once you get the hang of this, you'll laugh about any other type of lead generation... well... if your funnel contains big ticket items.
If you're working with small ticket items, you still won't use email. You'll use paid traffic, targeting your perfect client.
I haven't come across a list like this and it's something I've looked for across a few years.
The best solution I've come across is using LinkedIn and one step further LinkedIn Sales navigator adding LinkedIn Helper to automate the leads. You can target keywords like "ecommerce merchants" or "shopify supplier" etc. I've met many suppliers with this method.
Hope it helps!