the place to get glycin is the photographer's formulary ... the problem with
why don't you just mix up some ansco 130
and leave it as a stock solution and use it when you want ...
and mix up some dektol and use that ...

ansco 130 lasts for about a year, even longer in a undilute stock solution ...
i am still using some i mixed up december 2011 and it is doing just fine.