I sold my 9303 with no receiver a few weeks ago.
The highest offer on RR I received was $200, which is pathetic.
I ended up putting it on eBay and it went for about $325 shipped.
I doubt any of the bargain hungry and frugal guys at IRCHA will you give you $400, even though it is a great deal.
My advice to you would be to put the transmitter on eBay, no receivers. Take $325 like I did. Then sell the receivers on eBay, too, which should take in about $200 for all 3.
In total, you should EASILY be able to take in more than $500 for everything you got. But not on RR, not at IRCHA. These guys here all want something for nothing.