Reliable source for MSP & Shopify User List?

I'm seeking recommendations & references for reliable sources to buy email list of

(a) Shopify users
(b) Manager Service Providers (MSPs).

Any pointers are appreciated.

Thanks in advance.

submitted by /u/rsclmumbai
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source https://www.reddit.com/r/Emailmarketing/comments/ihjype/reliable_source_for_msp_shopify_user_list/