Easiest way is to have the buyer pay shipping and then suggest that they make the arrangements for pickup using their shipper of choice. Rather than you hunting down the best shipper to use for each destination, they work out what's best the one or two times for them and just notify you. Assuming you're not starting a business related to this, that's what I'd suggest, especially if you're selling at a really cut-rate. Any parts that normally have fluids in them will, of course, need to be completely drained.

If you've already got a deal in the works then this likely wouldn't work, but if you have any future deals you may consider this approach.

That being said, I'll have to let someone else chime in, as I have no experience shipping large used auto parts that had contained fluids.

And yes, this belongs in Talk, not here.