Generic Sheets and Printing dates

I keep seeing new generic sheets offered on e-bay at outrageous prices. People get them printed, then list them on e-bay as "rare" or "error". I normally don't look twice at them. Except, today I decided to look at the printing dates of the sheets. I noticed that several of them had been reprinted, and the reprints were not sold as generic sheets (as far as I know). For example, the Blue and White stamp (the beach scene) has had at least 10 different printing dates. Of these 10, I only have 7 in my collection at this point. The first printing was on 5/15/2007, and there was a second printing on 11/14/2007. I have both of these with the generic smiling face stamp on them. Then, there were two printings in 2008, 6/17/2008, and 11/6/2008. Both of these are offered on e-bay only with custom printed designs. In 2009, there were 5 different printings. The first was 2/4/2009 for the Passover comic book, then came the 2 sheets for the Pope's visit (3/24/2009 and 5/15/2009). The Casi Angeles sheet had an 8/5/2009 printing date. The last one in 2009 was the 12/2/2009 printing that again I only see offered on e-bay with custom printed designs. So far in 2010, there was 1 additional printing date (1/6/2010) that was used both for the Passover 2010 and the Herzl sheet.

The fun was not restricted to only the Blue and White stamp. The greetings stamps from 2003 also saw some reprints. It looks like the original set with the generic picture had two printing dates (7/17/2003 and 1/12/2004). There is also a bunch of good Luck stamps sheets with custom designs with a 12/1/2008 printing date, as well as a Thank You design with a 4/12/2007 date. The Good Luck design was also used for the soccer issue, with a 6/17/2008 date. The Hugs and Kisses stamp was reprinted for the Jetix issue on 2/10/2008.

The red and white flower design each had multiple printings. The original printing run was dated 1/30/2008, but the white flower sheet was reprinted on 10/7/2008 for the comedians issue, while both the red and white flowers appear to have been reprinted for custom designs with a 1/21/2009 printing date.

The Heart stamp has also seen multiple printings already. The initial printing was on 5/4/2009. That was followed with a 6/5/2009 printing for the Disney issue, and a 10/27/2009 printing for the Hanukkah issue. There was a 4/7/2010 printing for the second Disney issue as well.

I am missing several of these issues. Does anyone have some available for sale at reasonable prices? I am not interested in paying the hundreds of dollars a sheet some of the dealers want for their "scarce", "rare" and "error" creations.