There are tons of options available for eBay listings and most of them can be used whether you sell a few items a month or pay for a store subscription.

eBay on About.com - Seller Features Guide

The eBay subdomain of about.com has many great overviews and links that can help you make more money with better listings. This article about seller features doesn't point out the coolest part of some upgrades: eBay (apparently) randomly offers free upgrades on many listing features from time to time. I see it most often when you've had a "Buy It Now" listing up for more than two weeks. If you use the Revise Listing link on the top of an item, features like bold title in search results and second line in search results are free (where they normally cost $1.50-$2.50 each).

Enjoy - and be sure to share your eBay profile or store URL in the comments!

Styles on the Sly eBay Store