Unique price for user?

Hi All

I am looking for a way to implement a unique price for any user on a given product

i currently have 4 customer groups all at different prices and i allocate users to them based on spend...

some of the users buy huge volumes of one particular product and where i want to charge them the same for all the other products on my site based on their customer group.. i would like to offer them that particular product at a lower price

is there any way to do this as the software stands?

the only other way i can think to do it is to offer them their own user group but this could cause big problems for updating all the other pricing later on... ie if i have several people who have this functionality i will basically be updating hundreds of products prices on each user group just so they can have one special price!!!

does anyone have a solution for this?

I would really appreciate any help

thanks

Steve

you could use something like this, you can set discounts based on quantity, user group and more

http://www.opencart.com/index.php?route ... ESC&page=9