This is a simple 2-part job.
First Part: Set up a Payment module that works for checkout. I currently have an osCommerce setup with numerous types of ways to accept money, but when members select the payment type, it's not sending the money. I currently have a paying-member subscription from PayPal, and wouldn't mind setting up a PayPal checkout.
Second Part: I have an osCommerce Taxes section. It works if you include taxes on items (the DVD for 19.99 turns into 21.32), but I'd rather have it be added on during checkout...it just looks better that way.
Again, these are pretty simple things to do for the osCommerce buff...I've been trying to set both of them up, but for some reason, they're just not working!! I'm probably missing some really simple steps. Please bid away, I look forward to working with you.