I was thinking of incentives to offer to website visitors to get them subscribed to an e-mail list.

For a niche product site such as an Amazon product promo site, an idea may be to offer a money-off coupon to shop at a store that stocks similar items. But I don't know how willing an offline store would be to work with an affiliate marketer.

Traditionally we would offer an e-book on say tips to do stuff to get the subscriber.

But, I think it may be better to provide the tips in an e-mail series where you can include affiliate links in the drip-fed content and have the coupon as the initial carrot on a stick.

What is your experience/thoughts on doing this?