I checked with my order with 33Toys and I paid $120 for both Mikey and Donnie, so if he asks for $20 more I'll still only be paying $70 per figure, $80 if I misinterpreted what someone else said and it's $20 per figure.
$120 per figure would probably be the absolute limit on my interest in these figures. I'd give them some leeway as I really like the ones I have and anticipate going all in on the forthcoming enemies, but getting into the $135 and $150 territory is a bit crazy. They're not approaching Hot Toys quality. Those prices would limit my interest even for Mafex stuff.