Tinker,
I don't know how you got nothing because I just checked and got 32,000 results for Glock 19 and pages of purchase opportunities from $619 on down.
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One thing confusing to me is the repeated reports from some members that a Google Shopping search reveals no results, but every time I double check I get the opposite results. Dozens, hundreds or, as in this case, thousands of results pop up immediately.
I use the Barrett REC7 as my test subject because there won't be any airsoft counted in the results and I know that it isn't available in all 50 states. It keeps coming up day after day in spite of the complaints that no results are showing up for some folks.