What shall I do....?

I just realised I have access to a fairly large database of people that have/are spending a lot of money on a protein/supplements site. I am trying to find a way of monetising this list, however, I am not sure which would be the best way of doing so....
I'm thinking of finding a clickbank product to promote to them... or just selling the list (which I dont really want to do...) Im not sure what else I can do...
Also, Im not sure what the best way of sending out emails to this list would be... it needs to be cheap and not restrictive like mailchimp....

Any help/advice/suggestions welcome!

Thanks!

dazzler suggested Dandingo, but I'd recommend against them. I was with them a month and they basically stole $1100 in commissions. I tried contacting them over 20 times (phone, email, IM, they're web form), regarding my payout status and basically asking "where's my check?"... but never a single response in over 30 days of trying.

Many days of hard work on my part... and $1100 in hard won commissions... down the drain