When hubby had his sewing machine he made some headstalls and we would buy silver for them. He also cut our latigos and easy stuff like billets.
Believe it or not, the majority of stuff we trade for on FB or get off Ebay
We watch Ebay like a hawk for nice headstalls or ones with good silver that we can reuse or build new leather for. You have to know your makers to get a fair price other wise some sellers will try to gouge you. Or try to pawn something off that was made by a certain maker but is just a cheap knock off.
For easy stuff like rope halters, cinches, skid boots, polos, whatever, the store down the road has been cheaper than anything I have found on the internet. You have to really pick through the place to find the better quality because they do sell a lot of crap.