P&R K frames in 2.5" & 4", right now, are hotter than a June bride on Georgia asphalt.
66s in NRA VG and VG+ and up are starting at around $750-799, with 2.5" bringing significant premium. Matching box, add 15-20%, docs and tools add another 10-15%. 6" guns are also seeing modest gains.
You see a 4" No Dash or-1 , at $600-650, you should immediately buy imo.
Local/Pawnshops are your best options perhaps, as there are certainly regional variations in price, Gunbroker, as a national forum, is seeing significant price surges.