WIldcard Toys has a pre-order for the full set of Funko Pop 8-bit TMNT for $25.17, comes out to about $6.25 per figure. I think retail on these will be about $10 each, with delivery in February. Price shows as $35.96, but will drop automatically in cart.
Free shipping on orders over $75 though.
Personally, not sure what is the fascination with these pops, but there is quite a market for them.