UPS, FedEx, and DHL are a big piece of the solution to today's supply chain problems (presuming the parts exist at all). We've been spending enormous amounts of money on shipping lately. First, because we have to scour the planet to find parts. Second, because if we then just accept normal shipping they'll get tied up in the whole container ship nightmare.
To get parts these days, you often must:
1) Search them out across the globe;
2) Pay with company credit card or wire transfer (net 30 terms or lines of credit are a waste of time, they'll sell them instead to someone who will give them faster money); and
3) Ship via air so they can't play games with packaging and shipping delays.
We are now acting as the Purchasing department for most of the hard-to-find parts in our products. Our Contract Manufacturer simply cannot react fast enough; by the time their credit is confirmed by the seller's Accounts Payable department, the seller's Sales department has already sold the parts to someone with faster money. So we have established our own relationships with several key vendors and make instant payments to shove our way to the front of the line. The seller loves our immediate payment, we get our parts, and our CM keeps the production line running. BTW, we're saving back some of those shipping costs thanks to far better direct pricing than our CM used to get dealing with distributors.
This is how business gets done today. I hope it goes back to normal but we have to keep the lines running in the meantime.