Help for a Lo-Fi guy

Here ya go!

your description of the amp is correct

this amp has been made over 25-30 years so the value can be somewhat different depending on the age of it

basically it's sale value if in good condition is in the low $2000's, $2500 or more if it is a newer version with a sexy finish

Is there any extra tubes with it iso which ones and brands listed,

and you have to pack them very well and shipping cost today is a extra expense 

sell here on U.S audio mart , PayPal or stripe , if local pickup even better.

Those eBay asks are too high for used gear. The Polish ad is over new price, for a used unit. Forget the HiFi shark. Cary is selling new 300B SEIs direct for $3895.00, so estimate a fair used price accordingly. You didn’t say how old the units are or whether all of the original materials are still with the units, remotes, etc.

Any units that have been serviced, it is beneficial to have the service record, just as you would want with a car.

At this price, buyers will want to listen to them, or have a firm right to return for refund.

If you are offering the owner to buy them as-is, and you know they are working correctly, I might suggest 60-65% new MSRP assuming the cosmetics are excellent, the tubes are not too old and all the accessories are included, and less if there is less than that.