This used to mean that you were totally out of luck. You probably still are, but it is at least possible to run MiniVend on a virtual server such as HWY.NET.
You should be able to use the tlink.pl program and INET mode to start using MiniVend -- with quite a bit of work. You will need to hand-edit all of the configuration files, and use tlink.pl with the appropriate settings. Long term, you should put a compiled tlink in place.
You will also have to start the MiniVend daemon via a CGI program that you write.
Bottom line: don't try this unless most people call you a wizard. 8-)
The MiniVend web site has pointers to ISPs who happily host MiniVend.