Also, if you bought in 2016, you may have the tubular SPC arms. Not exactly sure when they changed designs, but I feel like it was only semi recently that the tube design was changed, because you can no longer get them as Mevotech arms from RockAuto. Now they're forged I believe and the price went up a bit with the design change.
Also COVID is probably not helping the situation, but I thought the newer arms were around $600 before the pandemic too. I dunno, I could be wrong on the pre-rona price.
edit: also see we're looking at different PNs, the ones I've been looking at are the 25480 that I found searching by 2005 4runner
Old SPC
Newer SPC