I just checked ebay and goldcnc is still a seller with the 100w fiber lasers listed. They have feedback of 19 shown at 88.9% and many of the 19 are from the same people for items that cost .99 - $1.
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A couple of points to be made here.... You CAN get at least a 50 watt inside the same size case as a 20 watt. Maybe my 20 watt is larger case, but at 8 1/4"x15"x17 1/2" my two are the same. I've opened the 50 watt and it has the correct JPT 50 watt source. It is tight inside, but fits. Actually looks like same case from the front with the same cutouts, but a couple of more holes for the mounting brackets. The other thing for anyone contemplating an eBay machine is DO NOT BUY from a seller that sells trinkets. They are just a total reseller and won't help at all. You MAY still have issues with the seller, but most of the time they will help.