One methods you could try also is by looking at sales letter at CB, and find the testimonial box, hope for they who also placed their website link, follow the link, and find their contact page, you can contact them asking for JV.

These people usually important player in your niche, while they are not big names, but they do have reputation.

Pointing to Mike post, yes, establishing partnership and relation is great for your future product launch. Today, it you might work harder.

SEO is one best think you can do to promote your product right now without JV, don't overlook it!