Hey Forest,
http://www.sellhealth.com
http://www.worldniche.com
On all of our standard sites it is one-time billing (we don't auto-ship product to the customers every month and rebill them) and you get a percentage on the sale. They can order anywhere from 1 to 12 units of product. So the commission on VigRX Plus for example is 50% and ranges from $38.50 for a single box, all the way up to $245.00 for a 12 month supply. So even if the customer only orders 1 box, you're earning more than you will with a trial offer.
We do also have a webmaster referral program so you get 5% of the sale price on all your referred webmasters' sales for life.
We may have other options available for VigRX Plus; contact me for details if interested. bruce AT sellhealth DOT com , ICQ: 166660479