If you do not use Photoshop, consider hiring someone to prepare them for you.
All comercial photography, especially product photography, is going to need at least some
post-processing. Indeed, the post-processing is often more extensive than the actual shooting -- and the shooting itself can get pretty involved, what with all the lighting and other types of preparation.
The last step in any such work is optimizing the image for the final format where it'll be used. Different techniques are necessary for printing in a catalog, making a billboard, or posting on the Web. Even if you magically got the image perfect in the camera, you'd still have to perform this last step, especially for the Web.
Fortunately, there are tools to help make this easier, and Photoshop's "Save for Web" is one of the best.
But...you might also want to consider not only hiring somebody to prepare your photos for you, but to take them as well. Photography is a craft like any other. It's one that anybody with a modicum of time and dedication can learn and do at least reasonably well...but it does
take that investment of time and effort.
Somebody who's made that investment is going to do a much better job at presenting your products in the best possible light -- and, don't forget, if you're selling things on the Internet, those photos are the primary experience your customers have of your product before they buy. Your product photography is probably the single most important aspect of your advertising efforts. And, unless you've already got a well-established customer base and you aren't looking to expand, nothing is more important to Internet sales than advertising (which most emphatically does not mean merely purchasing banner advertisements).
If budget is a concern, contact the local college / university / art school and hire a student majoring in photography to do the work. They'll appreciate the chance to build their portfolios and gain work experience, and they'll also have passion and artistic experience (and hopefully talent) that you're not going to match yourself -- if for no other reason than that you should
be busy with all the other important stuff of running your business.