I use Metro Pro Thread almost exclusively...I have all of the 5,000m cones and most of the 1000m cones in all colors. I have used this thread for over 12 years and have never had a problem. I also use their stabilizers and pre-wound bobbins. I have never found a better quality, sheen or value for any of their items elsewhere. There customer service is excellent and if you do encounter a problem, they are very prompt in fixing it. I can't recommend them enough. Here is a link if you are interested in checking out their products:

https://metroemb.com/store/index.php?route=common/home

Unless you only want to purchase only Isacord, you may wish to try ThreadArt. Polyester spools on sale for $1.99 and rayon spoons at $2.49! Extra 10% with discount code provided on Home Page.

https://www.threadart.com/

lots of good information, thank you.. but for some reason my machine will eat everything but isocord, or r a I have tried outer thread it is in a box in sewing room it just shreddes ,very fussy.