Somehow i don't really see the problem...
http://www.fudgerpg.com/retailers.html
some of these retailers are out of stock, but several carry the player's packs with 4 dice each, and one or two even have the GM pack still in stock.
Also, you could point your FLGS at GreyGhost and ask them to order some for you.
And if everything fails... GreyGhost even offers the possibility of direct orders.
I just poked around those sites, and I found one of them had exactly one GM's pack in stock.
Grey Ghost's site doesn't say whether they have the GM packs in stock or not. They mostly seem to want to shunt you to Warehouse23, which is out of stock.
The player's packs cost 5 bucks for 4 dice (plus/minus, depending on where you order). That'd be 25 bucks for 20, instead of the 15 for the GM pack, which is a pretty substantial difference in price.
The GM packs really are the way to go for a group playing a FATE game. It's just way more convenient to pick the things up in this format.