I thought $ 700 for a charging transformer was way too much and a whole charger should be a lot less. Other than being probalby 36 or 24 volts is there anything different than a normal car charger ?
I have not tried selling on ebay, so can not say about that part.
Living in a small town and with the price of gas being what it is, I can often find things on ebay cheaper than I can spend time and effort of driving to a larger town 40 miles away to where there may be a supply company.
I bought some carborator rebuilding kits for my weedeater and chain saws off ebay. I think they were less than $ 7 each counting shipping. By ordreing 3 items from one place, I got a 4th item free.
Unless I need it right away, I often look on ebay and Amazon for things. Usually I can get them for the same as store prices or less, but with free shiping. Just bought 2 TV sets. One for me and one to give for a birthday present. Ordred them from Best Buy as the shipping was free and I would have had to drive over 30 miles each way to the nearest BB. Then I could not be sure they would stock that modle. Shipping time was less than a week.
One day the local stores are going to go away just because of all the on line ordering.
I don't know how it is now, but years ago many times a person could not walk in off the street and buy something. I went with a friend to a boat motor supply house. A fellow walked in off the street and needed a small part, they could or would not sell him the part. My friend bought the part and resold it to the fellow for what it cost. Normally he would have marked it up about double.
For a good number of years my mother was a book keeper at a local electrical supply company. I could get anyting they had for their cost plus 10%. I don't recall the numbers, but they had 3 other prices starting at cost plus
30% and going up depending on how much business the others did with them.