i mix both fron scratch d-76 and d23
both are great i used d 23 now for two jears and since a few months d-76.
i always mix only one liter stocksolution and store it in 1/2 liter glassbottles with silicon stubbels (i hope thats the right word)
holds min. for 3 months but most time i mix new one all two or three weeks.
with some incredentias more you can mix some paper developers like dektol etc.
not cheaper but fun.