many sites offer back ordering services, you may check on godaddy.com
MMA pound for pound / Web Design
Godaddy sucks for this.
You might in fact try www.snapnames.com or www.pool.com
if you can wait, read this ICANN | Life Cycle of a Typical gTLD Domain Name
but if not, check namejet.com, maybe you can find those domain there with $69 starting price.
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