Hi guys,
to complete the last answer I'd precise that I've seen ( & bought some) SDS7s going from 150$ to 1800$. The problem is that the price don't reflect the real price or real state of the machine. you can find some perfect shape 5 modules brain for 400$ and some worn out brains at 1000$...
Also you can find some seriously revised machines for 600$ sometimes... all depends who sells and at what time.
Sellers want to get the most of it , some buyers are naive... but can it define a real quote out of it ?
some sellers claim don't knowing nothing in electronic and it kind of justify the poor state brains arrive.
So I think it all depends of actual needs and/or honesty of the seller. and needs or desire/naïvety of the buyer.
buying a Simmons is never simple in the end. So when you buy you have to be conscious of what you'll get and what use you'll have of it in the end. not easy before owning the machine.
Not mentioning about the known SDS7 issues...
When you sell you probably need to stay aware of that too...
be sure of the real state of the machine, it can work perfectly for while and getting some huge damages at the same time, breaking down 2 days later. Have a look to the battery first and that greenish potential stuff on the legs of components and PCB... That will define the work to do on it at first and then the price... One of the usual sds7's issues.
Either you do the maintenance before and sell at a coherent price either you sell as is... then...
only a personal point of view though,
good luck for your sale.
P.