Originally Posted by JuanMoore
Harbor freight no longer shows a lot of the smaller/cheaper items on the website. Some of the stores still carry the $2 blue manifolds and some don't. AFAIK all stores still carry the 4 way manifold with type M QD's, but it doesn't show on the website anymore either. I used 1/4" brass ball valves.
I went to Harbor Freight and they said they just redid the air fittings section and no longer stock the blue manifolds or any usable manifold for this purpose. The only manifold they have is this style
for about $9. This seems to be the end of a practical DIY manifold since the parts for a manifold are now at best $33 without check check valves and by the time you add the check valves you suggested that brings the price to around $46 (with S/H) which is only around $9 less then the commercial options. I guess if your looking for a less expensive solution your better off just sticking a bunch of barbed T or star connectors together for $5-10 and skip the valves otherwise go all the way and buy a commercial unit.
PS I did do the the thing I always end up doing at Harbor Freight, buying something I dont need. I got this 2 HP, 14" Heavy Duty Cut-Off Saw
for $59 to build my brew stand.