Hi OldRadio99 and welcome!
You can install InfoPath Forms Services (IPFS) on a non SharePoint machine (i.e. it should work standalone without MOSS). We have never set it up that way, but occasionally we do hear stories of others that have. Probably some work involved and obviously, you'd have to buy IPFS which is going to cost some money. We have a new Forms Hosting service called "FormsBoard" which we will be launching in a month or two. It will allow for simple InfoPath form submission from the web. The free version will be limited in various ways (total size of forms, users, etc.). Maybe that's another option. Best option would be if your customers could use InfoPath rich client ... :)