You can try Ontolo's link building query generator tool:
http://ontolo.com/link-building-query-generator-V2
Citation Labs also has great link building tools for finding prospects:
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You can try Ontolo's link building query generator tool:
http://ontolo.com/link-building-query-generator-V2
Citation Labs also has great link building tools for finding prospects:
Test them on a dummy site if you have the budget, or on some pages that already link to you.
The question that matters is what does SEO need from URLs?
That they be static.
That they feature your keywords.
What does Big Commerce do?
Provide static URLs (at least, based on what you've shown; I'm not a salesman or anything and have no affiliation)
Features product name (which presumably you control, and can thus include long tail KWs).
Granted, it's slightly less easy to type out the product page URLs for anyone wanting to link (they need to remember the caps and .html) but that's the least of your issues. I'd imagine you can just set up a 301 to make the urls typed in redirect if they get the casing wrong.
Lastly, regarding custom URLs, consider scalability. If the store succeeds ... are you really going to give each product page a custom URL manually? Not likely... So it's not that important.