around 1000-1500 depending on condition, accessories, harness, etc.
I picked up my 5.3 for 350 bux with harness/cpu it didnt have any accessories, but I was able to reuse a few of mine. I added a LS6 cam/springs for 150 and had the heads milled for more compression. I have around 1K in my motor (new cam bearings, valve seals, head gaskets, intake and valve cover gaskets included)
Just gave $2,300.00 for a LQ9 to my door, every nut and bolt in the deal, with 25,000 miles out of a chevy SS truck. Going to put an LS6 intake and throttle body and injector's on it, with a LS1 oil pan.
I gave $600 for my 2006 LQ4 with 58k on it, local here in ATL area. It came with PCM and hacked up harness, but was missing starter and alt. Bought another harness that I modified and accy's for under $200, so I figure I am in it around $1k after I sent the PCM off for programming.