Joomla - virtuemart help

[hobey19]

i have posted over on their forums, but i am hoping someone here is familiar with virtuemart

basically, what i need to be able to do is have products with negative prices in addition to standard-priced products. basically, the company i work for sells new and pre-owned equipment, but we will also come in and take equipment out of a facility upon request. we have a set price for each item that we are willing to pay site-unseen.

right now we are doing this all over the phone, but we are trying to get a web solution up and running. virtuemart allows me to set it up properly, but if the final total is negative (more buybacks than actual purchases), i get a 503 Service Temporarily Unavailable Error. as soon as i get that value back to positive, it works just fine. all i have found on their forums is that hypothetically it should work.

i realize this is a funny request, but i am hoping someone has some idea on how to proceed with this. i really like virtuemart, and would like to use it if it can be made to function how we need it to. any advice on how to proceed would be great

craig