online dues payment/non-profit

[phredrum]

We would like to let our members pay their dues, seminar fees, etc., online, the organization is non-profit, educational [501(C)3], dues are $25, appx 75 members are wired. Our new web host, VeoWeb, provides Interchange shopping cart but no info on how to set it up and the tech guy, when he gets around to responding, avoids the question or gives a vague reply. We need something so they can enter their info onsite, easy to use, inexpensive, AND INCLUDES DOCS.
Any suggestions appreciated.
Thanx,
Phred

[Podge]

I'm using www.worldpay.com for online transactions.

However a cheaper alternative would be www.revecom.com , I've heard good things about them.

www.clickbank.com is also recommended for transactions that don't require recurring billing.