I, of course, missed most of the ''most spectacular opening ceremony ever'' and l wanted to know if they will eventually be available for purchase and where will they be available?

They're available here:
l think it is a reasonable price.(Unless you want to get it on eBay;)
http://nbcuniversalstore.com/detail.php?p=65288&v=olympics&SESSID=7c1242af0975e282a21ced9f351f7661

In case you're interested in other things:
http://nbcuniversalstore.com/?v=olympics&SESSID=b570300db5657ecedd46bbc263dee81c

check out nbc universal store. It has the dvd and all sorts of Beijing Olympic goods for sell.

http://nbcuniversalstore.com/?v=olympics&SESSID=b570300db5657ecedd46bbc263dee81c

DVD:
http://nbcuniversalstore.com/detail.php?p=65288&v=olympics&SESSID=1e91a61d5d13a2d8eef36578aab17465

Note: stuff can only be shipped domestically

Yeah, you can find it at that NBC Universal store online all right, just as the others have said, but do not buy it on standard DVD! We want to be able to get it in high definition! Do not we?

Call NBC Universal is customer service number at 800-329-0892 and put pressure on them to make an HD consumer release version of these productions--the opening ceremony, the highlights, and the closing ceremony--on Blu-ray of course (or even D-VHS and HDV)!

You can download all Beijing Olympics Full video including opening and closing ceremony from
http://beijing-video.blogspot.com/