I bought the LSA set from an individual on ebay back in mid-2021 and they had been on B-O then for six months back then. My plans changed, I needed a different set now so I put the 4346 set back on eBay no reserve and they were bid to $800 back in Feb so there's a lot of interest in them. If you see a set, don't hesitate!
The good news is that OEM head BOLTS will still do the job and they are relatively cheap. ARP and ICTBillet bolts are another option.