Selling on E-bay as a "parts or repair" machine may be your best bet with the right computer. You can get a universal laptop charger that you can adjust the voltage and change out the tips depending on the machine.

If you get a good one it will last you for awhile. The first one that I bought burned up quick. The seller shipped me another one and so far so good. But you are dealing with garbage from China so your mileage may vary.

universal laptop charger | eBay



The above is a link for them. They seem to be cheaper than they used to be which means that they may burn up faster.

But the best bet is to have a good system of saving and storing the ones that you get through your travels.