Hello
A model I shot asked if posters could be produced to sell of one or two of the images I shot. I have no problem with this and we could share in the revenue but where would you start and also avoid a lot of up front money for posters.
On-line company that prints and mails ?

I'd just call a local printing company I use, find out what the minimum order is, find out how much it's going to cost, and then give the model a quote (along with something for my time and work to prepare the images, etc).

Either the model accepts it, which in case, get a deposit, or they don't.

The revenue sharing is fine, in theory, but how many will she sell, realistically?  Will she even be able to cover the costs?  The amount you'd get from it in a profit share is so little, you're better off just pricing up the job and giving her a quote.

I sell posters of the Boa Constrictors I shoot so I am not sure as far as what you guys are planning as far as splitting profits but generally when they are ordered I just submit the photo to costco and have a 20x30 print sent directly to the customer.  Prints are like 8.99 shipping is just under 4 and they are marked at $30.

http://fineartamerica.com/index.html

and many others do the same.

don't expect to get rich unless the model has a big following willing to spend money on her.

some models offer signed prints to their VIP customers (for example, sugar daddies who buy them stuff).

others do calendars. but unless the model has a big profile (like having their own porn site) i don't know if you can sell a lot of that stuff.