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If you look at the Moz On Page Report that I linked to above, it'll give you specific instructions on other fixes you can do to optimize your page. Follow those guidelines on all of your pages, and you should do well.

I noticed several things at a glance, primarily using moz's Google Chrome tool on this page: http://www.motivators.com/Promotional-BacktoSchool-Products-98.html

If your keyword phrase on this page is "back to school promotional products", You're on your way to being well-optimized for that phrase, but you'd want to add the phrase in your body copy, emphasizing it somewhere, and include the phrase in one or more of your image alt tags. However, that term is not searched very often using Google's AdWords Keyword Planner Tool. Continuing on... you could remove the "quick view" alt tags, as they are not doing anyone any good... Quick view of what? If a blind person (or a person with displaying images turned off) were trying to view (hear) the webpage, every link would say the same thing, therefore they won't know which to click on. The image alt tag is there for this purpose.

It also looks like you didn't put an alt tag on your product display images. Definitely a missed opportunity there. You used the product ID as the title, but no alt tag.

I'd be happy to help you optimize your site, but hopefully this will get you going.

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I have a site that easily has 15-20 images per product page, giving the users ideas of what they can do with the product design. All of them have an alt tag with the keyword phrase in it. There is also an H1, H2, sometimes an H3, body copy with the keyword phrase 1-3 times, bold when it seems like a good time to emphasize it. Just in the images alone, we've exceeded the recommended 15 keyword phrases on a page. Moz On Page Grader says the following:

Avoid Keyword Stuffing in Document

We've seen evidence that excessive use of keywords can negatively impact rankings and thus suggest moderation.

Recommendation: Remove instances of the targeted keyword(s) from the document text of this page to bring it below 15

What's the recommendation for the image alt tags? We'd like the images to show up in Google Images, so they should have the tag, right? What's the right way to handle this for SEO purposes? Someone's suggested naming 1/2 of the images one keyword phrase, and the other 1/2 an altogether different one, not searched nearly as often as the primary keyword phrase.

I ran a HTML markup validation tool (http://validator.w3.org) on a website. There were 140+ errors and 40+ warnings. IT says "W3C Validators are overly strict and would deny many modern constructs that browsers and search engines understand."

What a browser can understand and display to visitors is one thing, but what search engines can read has everything to do with the code.

I ask this: If the search engine crawler is reading thru the code and comes upon an error like this:

…ext/javascript" src="javaScript/mainNavMenuTime-ios.js"> </script>');}
The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element
in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).
One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create
cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer
the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).

and this...

<code class="input">…t("?");document.write('>');}</code>

The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).

One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).

Does this mean that the crawlers don't know where the code ends and the body text begins; what it should be focusing on and not?