I have an ecommerce site that does maybe 150 conversions or so every month. I want to test some design elements but have only used Google Site Optimizer but it takes way too long with my low conversions.
Any suggestions on what I can do to take advantage of A/B testing even with my small site?
Look into an sending an email to a GOOD LIST. You can't just dump an email out to thousands of people who might not be interested in your product or they won't come. Contact a reputable email list management company and try a drop using their advice for the creative. It could deliver the traffic you need. Be careful with other methods of "buying traffic" like pop-unders etc. In my experience they perform horribly.
You can step back a level in the conversion pipeline.
For example, you could assume that the goal of a product category page was to entice a customer to view one of the products. Make "visit a product page" the conversion event for purposes of testing category page changes.
Or, the goal of a product page is to get customers to add an item to the cart.
It's not perfect, but it can help you hone in on a more likely subset of changes to run longer tests on.