Have you got proven results from your sales page and funnel? What do you pay the affiliate is it worth him/her promoting your product?

If the launch has passed your product can still be a big success, however you need results to show affiliates if you want them on board. Once you have solid results affiliates will come Jjust refine your sales page and make sure your offer is appealing for affiliates and JV's and then you can pay for some advertising but more likely than not if its really good they will come to you.

An affiliate contest is a great way to motivate affiliates however results are needed first, so make sure your product converts well and then mayby move onto a small affiliate contest soon.

Hope this helps you a little