I feel you on that one but I primarily like to play standard so I like to have all the standard legal cards for deck brewing. I have slowly got into playing commander so I am sure I will slowly shift over as my local area plays more of it.
AquintonCardkingdom has 239.99 for a set. Way to much. Over priced. However for 20 dollars you get a foil of every common in Ixalan. Thats including Opt... opt as a foil is about 10 currently and will only rise because of the modern playability. Hmmm tempting to buy it. I love commons xD
BTW: Ixalan has 101 commons, 101 foil commons for 20 bucks especially Opt seems like a catchy deal. 40 bucks for uncommon foil set, 80 uncommons in the set.