Hi. I don't know where are you from, but here in Europe, the Ilford version of D-76, ID-11 is 10-30% cheaper. Strictly speaking the two are no longer identical since D-76 changed its formula recently but the results are the same. PMK is another story. I have never mixed it myself (I mean from separately purchased chemicals), but generally it is a very economical developer, so in my opinion it's not worth the effort.(posted 9204 days ago)