Using a website to sell a single product?

[trowelhead]

+1 for shopify

I've been using it for 3years plus and it's been fantastic.

Personally I would opt for getting a custom shopify theme built around your product as none of the pre existing shopify themes are that great for single product sites.

I speak from experience as I have just built a new shopify site for a single product we launched as a sideline gig. Accepting payment via PayPal and stripe as card processor

I'd also look to sell via eBay and Amazon for a three pronged attack!