J2EE App Servers

Hi

I am currently investigating the setup we'll need to develop java apps - we're looking to develop multi-tier applications using jsp,servlets and ejb's. We are however currently tied into using Microsoft IIS webservers. From what I can gather we therefore have no choice but to purchase an (expensive) J2EE App Server to handle the jsp, servlet and ejb's - like Borland's AppServer 4.5 both for development and deployment of our final application to our customers (assuming they want to host the application themselves).... Does anyone know of some less expensive options to handle this kind of Java development or can someone suggest an alternative architecture?

Many thanks.

[710 byte] By [Rloxley] at [2007-9-26 11:12:16]