I was going to recommend MPB or KEH as well. MPB does tend to have better prices, and both give warranties. KEH will get your order to you super quick, though. Use NORTHRUP-1 for 5% off as well. I am in the still-rocking-a-DSLR club. I’ll switch to one of the Canon R models eventually, but my 5DIV is still awesome, and my kit for it is good. I had one of those cheap Chinese L bracket knockoffs, but it developed play when tightened all the way. Bought a RRS in EX condition from KEH for like $80 (those things retail for like $200+ which is insane), and damn it is a nice piece. I hadn’t realized that it clamps onto the camera lug on the side for an additional mounting point. Anyway, I’m just trying to say that I’m still investing in my DSLR because it still makes awesome images. The mirrorless stuff has made incredible strides in AF and is now way better than DSLRs there, but the IQ is still going to be about the same on your keepers, so it just depends what you are looking for.