Purchase multiple items in one transaction
 

Is there any way in vBulletin to purchase multiple items in one transaction?

For instance, we have events where there are charges for registration, dinner, seminar, etc. I may have someone come with their spouse and want 1 registration, 2 dinners and 1 seminar. Someone else may want just 1 registration and 1 seminar. Another wants 1 registration, 4 dinners and 2 seminars. In the past, I have combined the variables to create single subscriptions - i.e. one registration, one dinner, one seminar -- one registration, two dinners, one seminar -- one registration, two dinners, two seminars, etc. In order to post every possible permutation of the options as a single subscription is very time consuming and confusing to the members. And they don't want to have to go through the payment process 3 or 4 times to get what they want.

I've looked at some shopping cart solutions, but haven't found any that people say are really 100% integrated with vBulletin. I really don't want or need a full fledged shopping cart/retail solution, just the ability for people to select more than one item and pay for all of them in one transaction.

Is this possible? Thanks for your help.
Tim