Diet supplements will always be in-demand, which makes weight loss an evergreen niche of affiliate marketing. Whether you are only starting with it or already have a number of diet programs to promote, O!Slim CPS offer is worth a look. Featuring a neat landing page in various languages, it is geared to customers in all European Union countries, Switzerland and Norway. Payments for the supplement are made in PayPal. No Prepayments, but possibility to have daily commission payouts through PayPal.