I don't have 'print packages' per say. I do have a single price for 8 wallet sized prints, as that is something that my lab offers.
On the print ordering part of my site, I just list the sizes that are available and let the clients put together whatever combination that they want. I could design packages and put them up for clients to choose from, but if I were to do that, I'd try to design them with the intent of enticing the client to order/spend more than they would normally. For example, if 8x10 prints are $50, then maybe a package of two 8x10s and two 5x7s is $90-$100. You add value to the package, without adding too much more to your cost of goods sold.
I think that some clients may like the idea of packages, as that is something that has been common for a very long time. They are used to it and maybe even expect it. Other people might like the idea of not being locking into packages and they like the idea of choosing just the prints they want and 'adding them to cart'.
As for printing, I have all my pro printing done by my lab. The do have some package templates/options...but even if I use something like that, I aks the lab to cut the prints anyway...so they are all individual prints when I deliver them to the clients.