why not have your jacks rebuilt by hwh? they can rebuild them for far less than new ones. the most they will charge is for a reman cylinder in case they cant repair yours.
what you asked for was the cost of a cylinder. they may not have had a reman one in stock at the time, and only had new ones. hwh can replace any part they have ever built with a suitable replacement. it may not be the same, but it will work.
send an email to email@example.com
. include your name, address, phone, vin of your chassis, brand and model. this is for your one year warranty.
describe your problem, and ask for a RGA number. this is for tracking your parts. it takes about three weeks to get them back.
many have done this with surprising results.
there are also several salvage yards for rv's that will have used parts.